Port forwarding for SMTP

2. VIA VIP :

$ telnet 10.155.65.43 25

Trying 10.155.65.43...

Connected to uat.my.saint-gobain.com (10.155.65.43).

Escape character is '^]'.

-------------- here “220 localhost ESMTP SubEthaSMTP” is missing !!!!!!!!!!!!!!!!!!!

HELO domain

220 localhost ESMTP SubEthaSMTP

250 localhost

QUIT

-------------- here no reaction/resonse from the node is 220 not a line below HELO domain??

this is my testing.

[root@ve10:Active] config  b virtual bar list
virtual bar {
   snat automap
   pool foo
   destination 172.28.19.79:25
   ip protocol 6
}

[root@ve10:Active] config  telnet 172.28.19.79 25
Trying 172.28.19.79...
Connected to 172.28.19.79 (172.28.19.79).
Escape character is '^]'.
220 mail.f5.com ESMTP
HELO me
250 mail.f5.com
QUIT
221 mail.f5.com
Connection closed by foreign host.

Hi Nitass

 

 

if you see both outputs you can find difference in sequence.

 

 

220 should be above HELO domain.

 

after QUIT command 221 sequence of aborting is missing.

220 should be above HELO domain. sorry i might misunderstand i.e. i thought you typed HELO too fast.

e.g.

[root@ve10:Active] config  telnet 172.28.19.79 25
Trying 172.28.19.79...
Connected to 172.28.19.79 (172.28.19.79).
Escape character is '^]'.
HELO me
220 mail.f5.com ESMTP
250 mail.f5.com

anyway, if it is not, is there any special setting in the virtual server configuration?

This is the current setting I have on F5.

 

 

[root@STG1F5LDB01:Active] config b virtual vs_jive_uat_25 list

 

virtual vs_jive_uat_25 {

 

snat automap

 

pool pool_jive_uat_25

 

destination 10.155.65.43:smtp

 

ip protocol tcp

 

profiles {

 

http {}

 

tcp {}

 

}

 

vlans INTERCO enable

 

}

 

[root@STG1F5LDB01:Active] config b pool pool_jive_uat_25 list

 

pool pool_jive_uat_25 {

 

members {

 

10.155.63.126:rtsserv {

 

priority 5

 

}

 

10.155.63.153:rtsserv {

 

priority 1

 

session user disabled

 

}

 

}

 

}

 

why do you use http profile for smtp traffic? does it really work??

I tried removing HTTP profile.

 

 

[root@STG1F5LDB01:Active] config b virtual vs_jive_uat_25 list

 

virtual vs_jive_uat_25 {

 

snat automap

 

pool pool_jive_uat_25

 

destination 10.155.65.43:smtp

 

ip protocol tcp

 

vlans INTERCO enable

 

}

 

[root@STG1F5LDB01:Active] config

 

 

and after this, when i tested, connection drops immediately.

 

 

Can you tell me tcpdump command to display capture during test? I want to test connection on VIP.

 

 

i tried below and did not had anything in capture.

 

 

[root@STG1F5LDB01:Active] config tcpdump -s0 dst 10.155.65.43 and dst port 25

 

tcpdump: WARNING: eth0: no IPv4 address assigned

 

tcpdump: verbose output suppressed, use -v or -vv for full protocol decode

 

listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes

 

 

0 packets captured

 

10 packets received by filter

 

0 packets dropped by kernel

 

Can you tell me tcpdump command to display capture during test? I want to test connection on VIP. can you try this?

 

 

to screen

 

tcpdump -nni 0.0 \(host 10.155.65.43 and port 25\) or \(host 10.155.63.126 or host 10.155.63.153 and port 2500\)

 

 

to file

 

tcpdump -nni 0.0:nnn -s0 -w /var/tmp/output.pcap \(host 10.155.65.43 and port 25\) or \(host 10.155.63.126 or host 10.155.63.153 and port 2500\)

Thanks Nitass, but issue is resolved now..after removing http profile.