F5 is upgrading its customer support chat feature on My.F5.com. Chat support will be unavailable from 6am-10am PST on 1/20/26. Refer to K000159584 for details.

Forum Discussion

sanzinc's avatar
sanzinc
Icon for Nimbostratus rankNimbostratus
Feb 26, 2024

LTM | Preserve Client IP Address in L3 Mode

TLDR; Is there any way to 'preserve original client source IP address' in the packets sent from LTM to the realserver? I am currently using a non-F5 SLB solution, looking to migrate to F5 LTM. But...
application delivery
irule
Sebastiansierra's avatar
Sebastiansierra
Icon for MVP rankMVP
Feb 27, 2024

Hi sanzinc,

To keep the real server IP you have some methods:

  1. Configure the default gateway in the application as the Self IP in the F5, and configure a couple of routing Virtual servers for UDP and TCP traffic, "this is probably the most fittable solution for you".
  2. Configure a layer 7 virtual server with an HTTP profile and configure the X-Forwarded-For.
  3. Use DSR o npath routing enabling asymetric traffic "not recommended".

Hope it works.