Forum Discussion

JG's avatar
JG
Icon for Cumulonimbus rankCumulonimbus
May 18, 2014

iRule for SMTP: Passing Client IP Addr to backend mail servers

When SNATs are used for a virtual server, the backend SMTP servers cannot get the client IP address. This irule is intended to replace the string after "EHLO" or "HELO" in mail client initiation with...
application delivery
deployment
devops
iRules
LTM
security
John_Alam_45640's avatar
John_Alam_45640
Historic F5 Account
May 19, 2014

To accommodate multiple messages, check out this SMTP proxy iRule example. https://devcentral.f5.com/wiki/iRules.SMTPProxy.ashx

 

It uses [TCP::collect] and the CLIENT_DATA event as well as [TCP::payload replace] instead of [STREAM::replace]. It offers more flexibility and allows multiple messages search/replace operations.