Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

uni's avatar
uni
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Feb 08, 2012

Source IP decision in Performance HTTP virtual

Can I make a load-balancing decision based on the source IP address with a Performance HTTP or Performance Layer 4 virtual? As I see it, the decision is made as soon as the client SYN is received, whi...
application delivery
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uni's avatar
uni
Icon for Altocumulus rankAltocumulus
Feb 08, 2012
Possibly, but http://support.f5.com/kb/en-us/solutions/public/8000/000/sol8082.html?sr=19200790l4 states that

 

the initial SYN request sent from the client to the BIG-IP LTM virtual server. The BIG-IP LTM makes the load balancing decision and passes the SYN request to the pool member.

 

So, at the point the load-balancing decision is made, there is no established connection so I guess it comes down to when an entry is inserted in the connection table - after the first SYN, after the SYN/ACK, or after the full handshake.