LTM VE

17 Topics

High CPU utilization (100%).
I observed high CPU utilization (100%) on F5 device, resource provision ASM nominal. I checked the client-side throughput and server-side throughput both are normal but found management interface throughput is very high and what i noticed this is happening in same time period for last 30 days. What could be the reason for this spike. Many thanks in advanced for your time and consideration.
Militza
Nov 18, 2024 Place Technical Forum
138Views
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14Comments
HSTS is not working.
Hi there, We have one irule is configured on VIP which is redirecting to maintenance page if user access the wrong url on that page HSTS is not working but if we access the right url then HSTS is working. We have enabled HSTS in http profile and that is attached to the same VIP with irule. Is there any way to enable HSTS on maintenance page or any remediation to fix that issue. if { $DEBUG } { log local0. "TEST - Source IP address: [IP::client_addr]" } switch -glob $uri_ext { "/httpfoo*" {set uri_int [string map {"/httpfoo" "/adapter_plain"} $uri_ext]} "/httptest*" {set uri_int [string map {"/httptest" "/adapter_plain"} $uri_ext]} default { HTTP::respond 200 content [ifile get ifile_service_unavailable_html] set OK 0 } } Many thanks in advance.
Solved
Militza
Nov 07, 2024 Place Technical Forum
105Views
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1Comment
HA Active/Standby add 2nd Floating IP from a different Vlan
I have 1 HA Active/Standby pair, I am looking to add a second floating IP for management access from our Management Vlan. We are wanting to access the configuration GUI from an internal URL and get to the Active F5 no matter which one is the active F5 Currently we have a floating self IP and a non floating IP on each of the pairs. What considerations do I need to take to accomplish this? Is this feasible? Do I need to add/change the SNAT pool? Will this affect config-sync or failover? SNAT pool: internal-snatpool 10.1.20.20 Current setup Example. prd1 10.1.20.1 - traffic-group-local-only, internal 10.20.30.213 - traffic-group-local-only, external 10.20.30.215 - traffic-group-1, external, port lockdown set to None 192.168.1.22 - traffic-group-local-only, HA prd2 10.1.20.2 - traffic-group-local-only, internal 10.20.30.214 - traffic-group-local-only, external 10.20.30.215 - traffic-group-1, external, port lockdown set to None 192.168.1.23 - traffic-group-local-only, HA possible setup example. prd1 10.1.20.1 - traffic-group-local-only, internal 10.20.30.213 - traffic-group-local-only, external 10.30.30.213 - traffic-group-local-only, external 10.20.30.215 - traffic-group-1, external, port lockdown set to None 10.30.30.215 - traffic-group-1, external, port lockdown set to default 192.168.1.22 - traffic-group-local-only, HA prd2 10.1.20.2 - traffic-group-local-only, internal 10.20.30.214 - traffic-group-local-only, external 10.30.30.214 - traffic-group-local-only, external 10.20.30.215 - traffic-group-1, external, port lockdown set to None 10.30.30.215 - traffic-group-1, external, port lockdown set to default 192.168.1.23 - traffic-group-local-only, HA
randallk
Aug 16, 2024 Place Technical Forum
92Views
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5Comments
Not able to change virtual server traffic group from traffic-group-local-only to traffic-group-1
We have two LTM device in which i observe one virtual server is missing in secondary device. I checked the virtual server configuration in primary that virtual server configure in traffic group from traffic-group-local-only now i am changing the traffic group but it is not changing. Is there any way to change it?
Solved
Militza
Aug 12, 2024 Place Technical Forum
69Views
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1Comment
LDAPS: intermittent login issues
We've integrated Active Directory with F5 ASM. However, we're experiencing intermittent login issues: sometimes we can log in using AD credentials, but other times we get a "remote server authentication failure" error.
kuldeep7985
Jul 26, 2024 Place Technical Forum
16Views
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0Comments
Any way to do DNS loadbalancing without BIG-IP DNS module?
Hi, In our environment we have a number of domain controllers which act as DNS servers for everything internally. Now, we have one specific type of client that is only able to be configured with a single IP address for its DNS server and this causes problems when a DNS server is down for maintenance. We run BIG-IP VE v16.1.4 with LTM, but not DNS, provisioned. I'd like to solve thiswithout provisioning the BIG-IP DNS module in this particular instance, by doing this: 1. Creating a new Stateless VS to receive DNS queries on port 53/udp 2. Assign a UDP protocol profile with "datagram" enabled (so it LBs every single packet) to the VS 3. Create a pool of DNS-servers 4. Create an internal DNS record that will be used to check that a DNS server responds with the correct RR. 5. Assign a "DNS" monitor to the pool and configure it to check service status by sending a DNS query for the RR I created the and seeing if the response is correct. However, the "DNS" monitor puts every server in the DOWN state. By using tcpdump on the BIG-IP VE I can see that the BIG-IP doesnot send any DNS query packets from this monitor to the DNS servers in the pool. I see a lot of other DNS queries from the BIG-IP (the servers in question is also the DNS servers for the BIG-IP). SO - should it even be possible to create a normal LTM pool containing DNS serversand having the BIG-IP monitor the service state of each member using the "DNS" monitor?
Solved
Moonlit
Jul 17, 2024 Place Technical Forum
83Views
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5Comments
Help with iRule
Good day all! I have the following iRule: when HTTP_REQUEST { if { ([HTTP::host] eq "lists.example.com") and ([HTTP::uri] eq "/cgi-bin/wa?INDEX" || [HTTP::uri] eq "/cgi-bin/wa?MOD" || [HTTP::uri] eq "/cgi-bin/wa?SYSCFG" || [HTTP::uri] eq "/cgi-bin/wa?OWNER" || [HTTP::uri] eq "/cgi-bin/wa?INDEX=" || [HTTP::uri] eq "/cgi-bin/wa?LOGON" || [HTTP::uri] eq "/cgi-bin/wa?LOGON=INDEX" || [HTTP::uri] eq "/cgi-bin/wa?LOGON=" || [HTTP::uri] eq "/cgi-bin/wa?ADMINDASH" || [HTTP::uri] eq "/cgi-bin/wa?LSTCR1") } { switch -glob [class match [IP::client_addr] eq "LISTSERV-TST_Allowed_IPs"] { "1" { return } default { HTTP::redirect "https://www.google.com/" } } } else { return } } As you can see, it is inefficient, and it doesn't account for all possibilities. Let me explain what I am aiming. If an `HTTP_REQUEST` comes to "lists.example.com" (`[HTTP::host]`), and the URI (`[HTTP::uri]`) isn't "/cgi-bin/wa?SUBEDIT1*" (that is, "cgi-bin/wa?SUBEDIT1", and anything after it), redirect it unless it is from an IP on the "LISTSERV-TST_Allowed_IPs", in which case, allow anything on the URI and continue to it. What would you do?
Solved
Fastidious
Jun 24, 2024 Place Technical Forum
169Views
0likes
15Comments
health monitor without hostname
hi guys, i have a health monitor without hostname GET /icap/AV HTTP/1.1\r\nConnection: Close\r\n\r\n we have 2 backend nodes . Just wnat to know what will be the hostname when traffic is sent to backend servers. will this add original FQDN from client traffic or it adds server IP address .etc
SV2022
Jun 20, 2024 Place Technical Forum
84Views
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6Comments
Reset cause
Hello, someone can help me with this? I've a F5 LTM VM and the sho /net rst-cause command displays this situation: TCP/IP Reset Cause RST Cause: Count ------------------------------------------- Flow expired (sweeper) 103387 No flow found for ACK 339414 No pool member available 0 RST from BIG-IP internal Linux host 659163 SSL handshake timeout exceeded 3 TCP RST from remote system 114027 TCP retransmit timeout 48 TCP zero window timeout 136 Unknown reason 57 handshake timeout 52912 I have tried enabling the logs on LTM in order to understand the handshake timeout resets cause but I am quite confused. I can't figure out the cause of the TCP handshakes or how increase them in the tcp profile. The LTM log returns me this error: RST sent from 10.109.120.228:35681 to 10.1.29.237:8403, [0x2f3864d:271] {peer} handshake timeout Thank you for your support.
rosarra
May 16, 2024 Place Technical Forum
198Views
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2Comments
vulnerabilities (CVE-2020-36363), CVE-2016-0736,CVE-2019-6593-FOR VERSION BIGIP LTM-16.1.4
Kindly guide me these vulnerabilities (CVE-2020-36363), (CVE-2016-0736), (CVE-2019-6593) -FOR VERSION BIGIP LTM-16.1. 4 are applicable or not. Thank you
Kuldeep22
Apr 23, 2024 Place Technical Forum
90Views
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1Comment