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Forum Discussion

davelutz's avatar
davelutz
Icon for Nimbostratus rankNimbostratus
Nov 23, 2020

Send node FQDN as http header instead of virtual server FQDN

I have a situation were I need my virtual server to listen for test.example.com but when the F5 talks to the nodes it communicates with them as node1.example.com or node2.example.com.   So for u...
application delivery
LTM
crodriguez's avatar
crodriguez
Ret. Employee
Nov 24, 2020

Nice! You beat me to the punch as I got distracted while preparing my response below. Note that [LB::server name] does not return the actual pool member or node name but rather a 3-element list containing the configuration name of the pool, the selected member's IP address, and service port. For example:

 

/Common/fqdn_pool 172.16.20.1 80

crodriguez's avatar
crodriguez
Ret. Employee
Nov 24, 2020

Absolutely agree on setting a default Host header if there is no match. Also, Pete's approach with a switch statement is preferable if you have only a handful of node IP addresses to map to FQDNs (up to about 15). Better performing than a datagroup.