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f5gurunot's avatar
f5gurunot
Icon for Cirrus rankCirrus
Feb 02, 2023
Solved

TCP Option 28 X-Forwarded-For Header

Using Akamai for DDOS mitigation and the requests sent to us show Akamai IP instead of the Client IP.  I have enabled TCP Option 28 and trying to insert the Client IP into X-Forwarded-For header.  I had to add this configuration into an existing iRule and getting Err_Connection_Reset.  Any assistance on what I'm doing wrong would be greatly appreciated.

The entire iRule is below and I have bolded the new TCP Option 28 config.  The rest of the iRule was working properly before I added this.

when CLIENT_ACCEPTED {

set proto 0

if { [PROFILE::exists clientssl] } {

set default_tls_pool [LB::server pool]
set detect_handshake 1
SSL::disable
TCP::collect

} else {
log local0. "This iRule is applied to a VS that has no clientssl profile."
set detect_handshake 0

}
set opt28 [TCP::option get 28]
if { [string length $opt28] == 5 } {
binary scan $opt28 c ver

if { $ver != 1 } {
log local0. "Unsupported Akamai version: $ver"

} else {
set optaddr [IP::addr parse -ipv4 $opt28 1]
}
}
}

when CLIENTSSL_CLIENTHELLO {
set proto 1
}

 

when HTTP_REQUEST {

if {$proto} {
if { [info exists optaddr] } {
HTTP::header insert X-Forwarded-Proto https
HTTP::header insert X-Forwarded-For $optaddr
} else {
HTTP::header insert X-Forwarded-Proto https
}
} else {
if { [info exists optaddr] } {
HTTP::header insert X-Forwarded-Proto http
HTTP::header insert X-Forwarded-For $optaddr
} else {
HTTP::header insert X-Forwarded-Proto http
}
}
}

when CLIENT_DATA {

if { ($detect_handshake) } {

binary scan [TCP::payload] cSS tls_xacttype tls_version tls_recordlen

switch $tls_version {
"769" -
"770" -
"771" {
if { ($tls_xacttype == 22) } {
binary scan [TCP::payload] @5c tls_action
if { not (($tls_action == 1) && ([TCP::payload length] > $tls_recordlen)) } {
set detect_handshake 0
}
}
}
default {
set detect_handshake 0
}
}

if { ($detect_handshake) } {

set record_offset 43
binary scan [TCP::payload] @${record_offset}c tls_sessidlen
set record_offset [expr {$record_offset + 1 + $tls_sessidlen}]
binary scan [TCP::payload] @${record_offset}S tls_ciphlen
set record_offset [expr {$record_offset + 2 + $tls_ciphlen}]
binary scan [TCP::payload] @${record_offset}c tls_complen
set record_offset [expr {$record_offset + 1 + $tls_complen}]

if { ([TCP::payload length] >= $record_offset) } {
binary scan [TCP::payload] @${record_offset}S tls_extenlen
set record_offset [expr {$record_offset + 2}]
binary scan [TCP::payload] @${record_offset}a* tls_extensions

for { set x 0 } { $x < $tls_extenlen } { incr x 4 } {
set start [expr {$x}]
binary scan $tls_extensions @${start}SS etype elen
if { ($etype == "00") } {

set grabstart [expr {$start + 9}]
set grabend [expr {$elen - 5}]
binary scan $tls_extensions @${grabstart}A${grabend} tls_servername
set start [expr {$start + $elen}]
} else {

set start [expr {$start + $elen}]
}
set x $start
}

if { ([info exists tls_servername] ) } {

set ssl_profile [class match -value [string tolower $tls_servername] ends_with tls_servername]
set tls_pool [class match -value [string tolower $tls_servername] ends_with tls_servername_pool]

if { $ssl_profile == "" } {

SSL::enable
} else {

set ssl_profile_enable "SSL::profile $ssl_profile"
catch { eval $ssl_profile_enable }
if { not ($tls_pool == "") } {
pool $tls_pool
} else {
pool $default_tls_pool
}
SSL::enable
}
} else {

SSL::enable
}

} else {

SSL::enable
}

set detect_handshake 0
TCP::release
} else {

set detect_handshake 0
SSL::enable
TCP::release

}
}
}

application delivery
  • xuwen's avatar
    xuwen
    Feb 03, 2023

    when CLIENT_DATA {
    set opt28 [TCP::option get 28]
    if { [string length $opt28] == 4 } {
    binary scan $opt28 H8 addr
    scan $addr "%2x%2x%2x%2x" ip1 ip2 ip3 ip4
    set optaddr "$ip1.$ip2.$ip3.$ip4"
    log local0. "optaddr is $optaddr"
    log local0. "ip addr parse result is [IP::addr parse -ipv4 $opt28]"
    }
    }

19 Replies

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  • xuwen's avatar
    xuwen
    Icon for Cumulonimbus rankCumulonimbus
    Feb 03, 2023

    Have you bound the created  tcp_option profile in this VS？

    create ltm profile tcp PROFILE_NAME tcp-options “{option <first|last>} {option <first|last>}”

    Can you give the configuration of list ltm virtual xxx and list ltm profile tcp tcp_option_XX and the error log in /var/log/ltm

    • f5gurunot's avatar
      f5gurunot
      Icon for Cirrus rankCirrus
      Feb 03, 2023

      Just ran the following and not getting connection reset anymore.

      tmsh create ltm profile tcp tcp_opt tcp-options "{28 first}"

      However, still not seeing the Client IP.

      Also, tried changing the HTTP_REQUEST to:


      when HTTP_REQUEST {
      if {$proto} {
      HTTP::header insert X-Forwarded-Proto https
      }
      else {
      HTTP::header insert X-Forwarded-Proto http
      }
      if { [info exists optaddr] } {
      HTTP::header insert X-Forwarded-For $optaddr
      }
      }

      • xuwen's avatar
        xuwen
        Icon for Cumulonimbus rankCumulonimbus
        Feb 03, 2023

        can you insert a code below "set opt28 [TCP::option get 28]"

        log local0. "tcp option 28 length is [string length $opt28]"

         and show the log give me, tail -f /var/log/ltm

    • f5gurunot's avatar
      f5gurunot
      Icon for Cirrus rankCirrus
      Feb 03, 2023

      ltm virtual test_443 {

          destination 5.5.5.5:https

          ip-protocol tcp

          last-modified-time 2023-02-02:18:49:31

          mask 255.255.255.255

          policies {

              asm_auto_l7_policy__test_443 { }

          }

          pool test_80

          profiles {

              ASM_WebASM_US_ONLY { }

              analytics { }

              http { }

              manual_test.com {

                  context clientside

              }

              tcp-analytics { }

              tcp_opt { }

              websecurity { }

              websocket { }

          }

          rules {

              Akamai_Opt28

          }

          security-log-profiles {

              "Log illegal requests"

          }

          serverssl-use-sni disabled

          source 0.0.0.0/0

          source-address-translation {

              type automap

          }

          translate-address enabled

          translate-port enabled

          vs-index 40

      }


      ltm profile tcp tcp_opt {

          app-service none

          tcp-options "{28 first}"

      }

  • Paulius's avatar
    Paulius
    Icon for MVP rankMVP
    Feb 03, 2023

    f5gurunot From my understanding Akamai is the one that would insert the true client-IP into the HTTP header because they are the source of the connection as far as your F5 is concerned. If the true client IP doesn't exist in the HTTP header that is squarly on Akamai. It is possible that Akamai has provided you the incorrect HTTP header field that they use to inject the client-IP into the HTTP header or it is possible that your pool members are not searching for the correct header field in the HTTP header. The only thing that inserting the client-IP into the HTTP header on the F5 will achieve would be to include the Akamai IP. Based on your virtual server configuration your pool members think the F5 is the source of the communication but should have an HTTP header inserted by Akamai and one inserted by the iRule named X-Forwarded-For. It is possible that you are overwriting the HTTP header field value with what is in the iRule if you all are using the same header field name.

    • f5gurunot's avatar
      f5gurunot
      Icon for Cirrus rankCirrus
      Feb 03, 2023

      If you are referring to the True-Client-IP header that Akamai uses instead of the X-Forwarded-For header that is not an option because our Akamai solution operates in TCP mode, not HTTP mode.  It only supports the following methods of source IP forwarding:  CIP, Option 28, Proxy Protocol v1 & v2.  We have enabled Option 28.

  • xuwen's avatar
    xuwen
    Icon for Cumulonimbus rankCumulonimbus
    Feb 03, 2023

    The simplest way is to perform tcpdump on the outside vlan(clientside) of F5. Wireshark observes whether have tcp option 28 field.

    For some company network, F5 only performs tcp forwarding, F5 performs tcp option 254 insertion, pool members nginx performs SSL offload and reads the value of F5's tcp option field, and then inserts it into HTTP XFF header. One of the pits is:
    Nginx downloads the open-source TOA module to read the value of tcp option, which can only be read in the tcp three handshakes. Unlike F5, F5 is convenient to directly use the TCP:: option function.

    F5 must be in SERVER_INIT event in V14+ version, execute tcp option 254 insertion. If F5 is lower than V14, nginx will be unable to read the value of tcp option 254

      • xuwen's avatar
        xuwen
        Icon for Cumulonimbus rankCumulonimbus
        Feb 03, 2023

        Observe the clientside tcpdump file of F5 to see if there is a tcp option 28 field.

        If not, check whether there is a firewall or other security cleaning equipment or The reverse proxy device in front of F5，It is better to restore iRules to a state without tcp option 28 and exec tcpdump command.

        if wireshark pcap file has tcp option 28 field:

        Because your iRules in CLIENT_ACCEPED event executed TCP:: collect command, I personally estimate that your tcp option 28 code should be placed in CLIENT_DATA event(personally advise, have not test in BIGIP VE environment)

        when CLIENT_DATA {
 set opt28 [TCP::option get 28]
 log local0. "tcp option 28 length is [string length $opt28]"
 ........
 }

         

  • xuwen's avatar
    xuwen
    Icon for Cumulonimbus rankCumulonimbus
    Feb 03, 2023

    i just used two BIGIP V16 VE test,

    F5-1(set/insert tcp option 28) ====> F5-2(read/get tcp option 28 value)

    i find that:

    if F5-1 set tcp option 28 not in SERVER_INIT event(test in SERVER_CONNECTED), it will insert tcp option 28 in tcp data(not insert in tcp three handshake process), F5-2 in CLIENT_ACCEPTED event log [string length [TCP::option get 28]] is 0 and in CLIENT_DATA or HTTP_REQUEST event log [string length [TCP::option get 28]] is 4, This corresponds to the picture Akamai gave you the pcap.png content，Akamai insert tcp option 28 is in tcp data, not in tcp three handshake process，so you use set opt28 [TCP::option get 28]; log local0. "tcp option 28 length is [string length $opt28]"

    in CLIENT_ACCEPTED event, the value is 0

    Feb  3 23:30:49 f5 info tmm[10530]: Rule /Common/gslb_http <CLIENT_ACCEPTED>: tcp option 28 length in CLIENT_ACCEPTED is 0
Feb  3 23:30:49 f5 info tmm[10530]: Rule /Common/gslb_http <CLIENT_DATA>: tcp option 28 length in CLIENT_DATA is 4
Feb  3 23:30:49 f5 info tmm[10530]: Rule /Common/gslb_http <CLIENT_ACCEPTED>: tcp option 28 length in CLIENT_ACCEPTED is 0
Feb  3 23:30:49 f5 info tmm[10530]: Rule /Common/gslb_http <HTTP_REQUEST>: tcp option 28 length in HTTP_REQUEST is 4
Feb  3 23:30:49 f5 info tmm[10530]: Rule /Common/gslb_http <CLIENT_DATA>: tcp option 28 length in CLIENT_DATA is 4
Feb  3 23:30:49 f5 info tmm[10530]: Rule /Common/gslb_http <HTTP_REQUEST>: tcp option 28 length in HTTP_REQUEST is 4

     

    if F5-1 set tcp option 28 in SERVER_INIT event, it will insert tcp option 28 in (tcp syn, tcp ack, tcp data), and F5-2 in CLIENT_ACCEPTED, CLIENT_DATA, HTTP_REQUEST event is log [string length [TCP::option get 28]] is 4

    Feb  3 23:32:11 f5 info tmm[10530]: Rule /Common/gslb_http <CLIENT_ACCEPTED>: tcp option 28 length in CLIENT_ACCEPTED is 4
Feb  3 23:32:11 f5 info tmm[10530]: Rule /Common/gslb_http <CLIENT_DATA>: tcp option 28 length in CLIENT_DATA is 4
Feb  3 23:32:11 f5 info tmm[10530]: Rule /Common/gslb_http <CLIENT_ACCEPTED>: tcp option 28 length in CLIENT_ACCEPTED is 4
Feb  3 23:32:11 f5 info tmm[10530]: Rule /Common/gslb_http <HTTP_REQUEST>: tcp option 28 length in HTTP_REQUEST is 4
Feb  3 23:32:11 f5 info tmm[10530]: Rule /Common/gslb_http <CLIENT_DATA>: tcp option 28 length in CLIENT_DATA is 4
Feb  3 23:32:11 f5 info tmm[10530]: Rule /Common/gslb_http <HTTP_REQUEST>: tcp option 28 length in HTTP_REQUEST is 4

     

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Option 28 X-Forwarded-For Header","id":"message:309659","revisionNum":2,"repliesCount":19,"author":{"__ref":"User:user:422095"},"depth":0,"hasGivenKudo":false,"board":{"__ref":"Forum:board:TechnicalForum"},"conversation":{"__ref":"Conversation:conversation:309659"},"readOnly":false,"editFrozen":false,"moderationData":{"__ref":"ModerationData:moderation_data:309659"},"body":"

Using Akamai for DDOS mitigation and the requests sent to us show Akamai IP instead of the Client IP.  I have enabled TCP Option 28 and trying to insert the Client IP into X-Forwarded-For header.  I had to add this configuration into an existing iRule and getting Err_Connection_Reset.  Any assistance on what I'm doing wrong would be greatly appreciated.

The entire iRule is below and I have bolded the new TCP Option 28 config.  The rest of the iRule was working properly before I added this.

when CLIENT_ACCEPTED {

set proto 0

if { [PROFILE::exists clientssl] } {

set default_tls_pool [LB::server pool]
set detect_handshake 1
SSL::disable
TCP::collect

} else {
log local0. \"This iRule is applied to a VS that has no clientssl profile.\"
set detect_handshake 0

}
set opt28 [TCP::option get 28]
if { [string length $opt28] == 5 } {
binary scan $opt28 c ver

if { $ver != 1 } {
log local0. \"Unsupported Akamai version: $ver\"

} else {
set optaddr [IP::addr parse -ipv4 $opt28 1]
}
}
}

when CLIENTSSL_CLIENTHELLO {
set proto 1
}

 

when HTTP_REQUEST {

if {$proto} {
if { [info exists optaddr] } {
HTTP::header insert X-Forwarded-Proto https
HTTP::header insert X-Forwarded-For $optaddr
} else {
HTTP::header insert X-Forwarded-Proto https
}
} else {
if { [info exists optaddr] } {
HTTP::header insert X-Forwarded-Proto http
HTTP::header insert X-Forwarded-For $optaddr
} else {
HTTP::header insert X-Forwarded-Proto http
}
}
}

when CLIENT_DATA {

if { ($detect_handshake) } {

binary scan [TCP::payload] cSS tls_xacttype tls_version tls_recordlen

switch $tls_version {
\"769\" -
\"770\" -
\"771\" {
if { ($tls_xacttype == 22) } {
binary scan [TCP::payload] @5c tls_action
if { not (($tls_action == 1) && ([TCP::payload length] > $tls_recordlen)) } {
set detect_handshake 0
}
}
}
default {
set detect_handshake 0
}
}

if { ($detect_handshake) } {

set record_offset 43
binary scan [TCP::payload] @${record_offset}c tls_sessidlen
set record_offset [expr {$record_offset + 1 + $tls_sessidlen}]
binary scan [TCP::payload] @${record_offset}S tls_ciphlen
set record_offset [expr {$record_offset + 2 + $tls_ciphlen}]
binary scan [TCP::payload] @${record_offset}c tls_complen
set record_offset [expr {$record_offset + 1 + $tls_complen}]

if { ([TCP::payload length] >= $record_offset) } {
binary scan [TCP::payload] @${record_offset}S tls_extenlen
set record_offset [expr {$record_offset + 2}]
binary scan [TCP::payload] @${record_offset}a* tls_extensions

for { set x 0 } { $x < $tls_extenlen } { incr x 4 } {
set start [expr {$x}]
binary scan $tls_extensions @${start}SS etype elen
if { ($etype == \"00\") } {

set grabstart [expr {$start + 9}]
set grabend [expr {$elen - 5}]
binary scan $tls_extensions @${grabstart}A${grabend} tls_servername
set start [expr {$start + $elen}]
} else {

set start [expr {$start + $elen}]
}
set x $start
}

if { ([info exists tls_servername] ) } {

set ssl_profile [class match -value [string tolower $tls_servername] ends_with tls_servername]
set tls_pool [class match -value [string tolower $tls_servername] ends_with tls_servername_pool]

if { $ssl_profile == \"\" } {

SSL::enable
} else {

set ssl_profile_enable \"SSL::profile $ssl_profile\"
catch { eval $ssl_profile_enable }
if { not ($tls_pool == \"\") } {
pool $tls_pool
} else {
pool $default_tls_pool
}
SSL::enable
}
} else {

SSL::enable
}

} else {

SSL::enable
}

set detect_handshake 0
TCP::release
} else {

set detect_handshake 0
SSL::enable
TCP::release

}
}
}

","body@stringLength":"4405","rawBody":"

Using Akamai for DDOS mitigation and the requests sent to us show Akamai IP instead of the Client IP.  I have enabled TCP Option 28 and trying to insert the Client IP into X-Forwarded-For header.  I had to add this configuration into an existing iRule and getting Err_Connection_Reset.  Any assistance on what I'm doing wrong would be greatly appreciated.

The entire iRule is below and I have bolded the new TCP Option 28 config.  The rest of the iRule was working properly before I added this.

when CLIENT_ACCEPTED {

set proto 0

if { [PROFILE::exists clientssl] } {

set default_tls_pool [LB::server pool]
set detect_handshake 1
SSL::disable
TCP::collect

} else {
log local0. \"This iRule is applied to a VS that has no clientssl profile.\"
set detect_handshake 0

}
set opt28 [TCP::option get 28]
if { [string length $opt28] == 5 } {
binary scan $opt28 c ver

if { $ver != 1 } {
log local0. \"Unsupported Akamai version: $ver\"

} else {
set optaddr [IP::addr parse -ipv4 $opt28 1]
}
}
}

when CLIENTSSL_CLIENTHELLO {
set proto 1
}

 

when HTTP_REQUEST {

if {$proto} {
if { [info exists optaddr] } {
HTTP::header insert X-Forwarded-Proto https
HTTP::header insert X-Forwarded-For $optaddr
} else {
HTTP::header insert X-Forwarded-Proto https
}
} else {
if { [info exists optaddr] } {
HTTP::header insert X-Forwarded-Proto http
HTTP::header insert X-Forwarded-For $optaddr
} else {
HTTP::header insert X-Forwarded-Proto http
}
}
}

when CLIENT_DATA {

if { ($detect_handshake) } {

binary scan [TCP::payload] cSS tls_xacttype tls_version tls_recordlen

switch $tls_version {
\"769\" -
\"770\" -
\"771\" {
if { ($tls_xacttype == 22) } {
binary scan [TCP::payload] @5c tls_action
if { not (($tls_action == 1) && ([TCP::payload length] > $tls_recordlen)) } {
set detect_handshake 0
}
}
}
default {
set detect_handshake 0
}
}

if { ($detect_handshake) } {

set record_offset 43
binary scan [TCP::payload] @${record_offset}c tls_sessidlen
set record_offset [expr {$record_offset + 1 + $tls_sessidlen}]
binary scan [TCP::payload] @${record_offset}S tls_ciphlen
set record_offset [expr {$record_offset + 2 + $tls_ciphlen}]
binary scan [TCP::payload] @${record_offset}c tls_complen
set record_offset [expr {$record_offset + 1 + $tls_complen}]

if { ([TCP::payload length] >= $record_offset) } {
binary scan [TCP::payload] @${record_offset}S tls_extenlen
set record_offset [expr {$record_offset + 2}]
binary scan [TCP::payload] @${record_offset}a* tls_extensions

for { set x 0 } { $x < $tls_extenlen } { incr x 4 } {
set start [expr {$x}]
binary scan $tls_extensions @${start}SS etype elen
if { ($etype == \"00\") } {

set grabstart [expr {$start + 9}]
set grabend [expr {$elen - 5}]
binary scan $tls_extensions @${grabstart}A${grabend} tls_servername
set start [expr {$start + $elen}]
} else {

set start [expr {$start + $elen}]
}
set x $start
}

if { ([info exists tls_servername] ) } {

set ssl_profile [class match -value [string tolower $tls_servername] ends_with tls_servername]
set tls_pool [class match -value [string tolower $tls_servername] ends_with tls_servername_pool]

if { $ssl_profile == \"\" } {

SSL::enable
} else {

set ssl_profile_enable \"SSL::profile $ssl_profile\"
catch { eval $ssl_profile_enable }
if { not ($tls_pool == \"\") } {
pool $tls_pool
} else {
pool $default_tls_pool
}
SSL::enable
}
} else {

SSL::enable
}

} else {

SSL::enable
}

set detect_handshake 0
TCP::release
} else {

set detect_handshake 0
SSL::enable
TCP::release

}
}
}

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TCP Option 28 X-Forwarded-For Header","moderationData":{"__ref":"ModerationData:moderation_data:309670"},"body":"

Have you bound the created  tcp_option profile in this VS？

\n

create ltm profile tcp PROFILE_NAME tcp-options “{option <first|last>} {option <first|last>}”

\n

Can you give the configuration of list ltm virtual xxx and list ltm profile tcp tcp_option_XX and the error log in /var/log/ltm

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Just ran the following and not getting connection reset anymore.

tmsh create ltm profile tcp tcp_opt tcp-options \"{28 first}\"

However, still not seeing the Client IP.

Also, tried changing the HTTP_REQUEST to:


when HTTP_REQUEST {
if {$proto} {
HTTP::header insert X-Forwarded-Proto https
}
else {
HTTP::header insert X-Forwarded-Proto http
}
if { [info exists optaddr] } {
HTTP::header insert X-Forwarded-For $optaddr
}
}

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can you insert a code below \"set opt28 [TCP::option get 28]\"

\n
log local0. \"tcp option 28 length is [string length $opt28]\"
\n

 and show the log give me, tail -f /var/log/ltm

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ltm virtual test_443 {

    destination 5.5.5.5:https

    ip-protocol tcp

    last-modified-time 2023-02-02:18:49:31

    mask 255.255.255.255

    policies {

        asm_auto_l7_policy__test_443 { }

    }

    pool test_80

    profiles {

        ASM_WebASM_US_ONLY { }

        analytics { }

        http { }

        manual_test.com {

            context clientside

        }

        tcp-analytics { }

        tcp_opt { }

        websecurity { }

        websocket { }

    }

    rules {

        Akamai_Opt28

    }

    security-log-profiles {

        \"Log illegal requests\"

    }

    serverssl-use-sni disabled

    source 0.0.0.0/0

    source-address-translation {

        type automap

    }

    translate-address enabled

    translate-port enabled

    vs-index 40

}


ltm profile tcp tcp_opt {

    app-service none

    tcp-options \"{28 first}\"

}

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f5gurunot From my understanding Akamai is the one that would insert the true client-IP into the HTTP header because they are the source of the connection as far as your F5 is concerned. If the true client IP doesn't exist in the HTTP header that is squarly on Akamai. It is possible that Akamai has provided you the incorrect HTTP header field that they use to inject the client-IP into the HTTP header or it is possible that your pool members are not searching for the correct header field in the HTTP header. The only thing that inserting the client-IP into the HTTP header on the F5 will achieve would be to include the Akamai IP. Based on your virtual server configuration your pool members think the F5 is the source of the communication but should have an HTTP header inserted by Akamai and one inserted by the iRule named X-Forwarded-For. It is possible that you are overwriting the HTTP header field value with what is in the iRule if you all are using the same header field name.

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If you are referring to the True-Client-IP header that Akamai uses instead of the X-Forwarded-For header that is not an option because our Akamai solution operates in TCP mode, not HTTP mode.  It only supports the following methods of source IP forwarding:  CIP, Option 28, Proxy Protocol v1 & v2.  We have enabled Option 28.

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The simplest way is to perform tcpdump on the outside vlan(clientside) of F5. Wireshark observes whether have tcp option 28 field.

\n

For some company network, F5 only performs tcp forwarding, F5 performs tcp option 254 insertion, pool members nginx performs SSL offload and reads the value of F5's tcp option field, and then inserts it into HTTP XFF header. One of the pits is:
Nginx downloads the open-source TOA module to read the value of tcp option, which can only be read in the tcp three handshakes. Unlike F5, F5 is convenient to directly use the TCP:: option function.

\n

F5 must be in SERVER_INIT event in V14+ version, execute tcp option 254 insertion. If F5 is lower than V14, nginx will be unable to read the value of tcp option 254

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We are on version 17, will get a tcpdump.

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Observe the clientside tcpdump file of F5 to see if there is a tcp option 28 field.

\n

If not, check whether there is a firewall or other security cleaning equipment or The reverse proxy device in front of F5，It is better to restore iRules to a state without tcp option 28 and exec tcpdump command.

\n

if wireshark pcap file has tcp option 28 field:

\n

Because your iRules in CLIENT_ACCEPED event executed TCP:: collect command, I personally estimate that your tcp option 28 code should be placed in CLIENT_DATA event(personally advise, have not test in BIGIP VE environment)

\n
when CLIENT_DATA {\n set opt28 [TCP::option get 28]\n log local0. \"tcp option 28 length is [string length $opt28]\"\n ........\n }
\n

 

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i just used two BIGIP V16 VE test,

\n

F5-1(set/insert tcp option 28) ====> F5-2(read/get tcp option 28 value)

\n

i find that:

\n

if F5-1 set tcp option 28 not in SERVER_INIT event(test in SERVER_CONNECTED), it will insert tcp option 28 in tcp data(not insert in tcp three handshake process), F5-2 in CLIENT_ACCEPTED event log [string length [TCP::option get 28]] is 0 and in CLIENT_DATA or HTTP_REQUEST event log [string length [TCP::option get 28]] is 4, This corresponds to the picture Akamai gave you the pcap.png content，Akamai insert tcp option 28 is in tcp data, not in tcp three handshake process，so you use set opt28 [TCP::option get 28]; log local0. \"tcp option 28 length is [string length $opt28]\"

\n

in CLIENT_ACCEPTED event, the value is 0

\n
Feb  3 23:30:49 f5 info tmm[10530]: Rule /Common/gslb_http <CLIENT_ACCEPTED>: tcp option 28 length in CLIENT_ACCEPTED is 0\nFeb  3 23:30:49 f5 info tmm[10530]: Rule /Common/gslb_http <CLIENT_DATA>: tcp option 28 length in CLIENT_DATA is 4\nFeb  3 23:30:49 f5 info tmm[10530]: Rule /Common/gslb_http <CLIENT_ACCEPTED>: tcp option 28 length in CLIENT_ACCEPTED is 0\nFeb  3 23:30:49 f5 info tmm[10530]: Rule /Common/gslb_http <HTTP_REQUEST>: tcp option 28 length in HTTP_REQUEST is 4\nFeb  3 23:30:49 f5 info tmm[10530]: Rule /Common/gslb_http <CLIENT_DATA>: tcp option 28 length in CLIENT_DATA is 4\nFeb  3 23:30:49 f5 info tmm[10530]: Rule /Common/gslb_http <HTTP_REQUEST>: tcp option 28 length in HTTP_REQUEST is 4
\n

 

\n

if F5-1 set tcp option 28 in SERVER_INIT event, it will insert tcp option 28 in (tcp syn, tcp ack, tcp data), and F5-2 in CLIENT_ACCEPTED, CLIENT_DATA, HTTP_REQUEST event is log [string length [TCP::option get 28]] is 4

\n
Feb  3 23:32:11 f5 info tmm[10530]: Rule /Common/gslb_http <CLIENT_ACCEPTED>: tcp option 28 length in CLIENT_ACCEPTED is 4\nFeb  3 23:32:11 f5 info tmm[10530]: Rule /Common/gslb_http <CLIENT_DATA>: tcp option 28 length in CLIENT_DATA is 4\nFeb  3 23:32:11 f5 info tmm[10530]: Rule /Common/gslb_http <CLIENT_ACCEPTED>: tcp option 28 length in CLIENT_ACCEPTED is 4\nFeb  3 23:32:11 f5 info tmm[10530]: Rule /Common/gslb_http <HTTP_REQUEST>: tcp option 28 length in HTTP_REQUEST is 4\nFeb  3 23:32:11 f5 info tmm[10530]: Rule /Common/gslb_http <CLIENT_DATA>: tcp option 28 length in CLIENT_DATA is 4\nFeb  3 23:32:11 f5 info tmm[10530]: Rule /Common/gslb_http <HTTP_REQUEST>: tcp option 28 length in HTTP_REQUEST is 4
\n

 

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when CLIENT_DATA {
set opt28 [TCP::option get 28]
if { [string length $opt28] == 4 } {
binary scan $opt28 H8 addr
scan $addr \"%2x%2x%2x%2x\" ip1 ip2 ip3 ip4
set optaddr \"$ip1.$ip2.$ip3.$ip4\"
log local0. \"optaddr is $optaddr\"
log local0. \"ip addr parse result is [IP::addr parse -ipv4 $opt28]\"
}
}

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The F5 Academy Roadshow is rolling into 19 cities (plus two virtual stops), and if you work with apps, APIs, or infrastructure, this event was built for you.

\n\n

 

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In the ever-evolving world of application delivery and security, gaining actionable insights into your infrastructure and applications has become more critical than ever. The Application Study Tool (AST) is designed to help technical teams and administrators leverage the power of open-source telemetry and visualization tools to enhance their monitoring, diagnostics, and analysis workflows.

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