Forum Discussion
superblue1999_8
Nimbostratus
Dec 14, 2010How does the IP forwarding works ?
Hi everyone,
I got a BIGIP LTM VE working after countless hours, however I still don't quite understand how come it works in terms of routing ... I hope some one can help me to understand the IP forwarding of this platform.
Here is my setup, all the VM are on a single ESX server with vswitch
Web_server1------vlan 52-----BIGIP --------Vlan 52--------IP cloud -----------Vlan 100 -------Testing Client
|
Web_server1------vlan52---------
All the three NIC on BIGIP is in Vlan 52 network.
I configured 192.168.1.1 as the selfip on 1.1 interface, and two web servers are using it as the default gateway, it is working, but how come it works ?
1. All the web servers and self IP are in 192.168.1.0/24 network
2. the virtual IP is in 10.0.0.0/24 network, there is no other route configured
3. the management IP is in 10.0.0.0/24 network, with a default route
When I send a HTTP request to the webserver, my source IP is not in any of the subnet that BIGIP is aware of, so I guess it needs a default route to return to me, but I didn't configure it anywhere, the only default route configuration is for the management port.
How come it works ?
Thanks a lot
Harry.
- hoolio
Cirrostratus
Hi Harry, - superblue1999_8
Nimbostratus
Hi Aron, - superblue1999_8
Nimbostratus
hmm, it looks it can work without any routing configured, I removed all the routing and only leave with connected interface, and I can still access the VIP from outside. - viks_96432
Nimbostratus
Did you manage to crack this ? I am also in a similar fix. I can't understand how F5 is routing requests for subnets that it's not aware of :(
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