MAC2014_141917
Jan 22, 2014Nimbostratus
F5 - Npath routing
Hi,
I'm trying to setup Npath routing by the book: http://support.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/ltm_implementation/sol_npath.html However there are some issues and doubts about this configuration.
First of all, everything is on the same network:
Client IP: 10.233.203.222
Load Balancer F5 Big-IP (version 10.2.1) Virtual IP: 10.233.203.218
Pool members: 10.233.203.216 and 10.233.203.217
Route table in each pool member:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default 10.233.203.129 0.0.0.0 UG 0 0 0 eth0
10.233.203.0 * 255.255.255.0 U 0 0 0 eth0
link-local * 255.255.0.0 U 1002 0 0 eth0
As described in documentation I added Virtual Server IP in loopback interface using the following command:
ip addr add 10.233.203.218 label lo:0 dev lo scope global
I'm not a network specialist but I would like to understand the flow between request and response using Npath.
Some doubts:
- What's the role of VIP in loopback interface?
- Why even LB down I'm able to ping 10.233.203.218 (VIP) from outside? Is it not supposed loopback does not accept traffic from outside?
- Because everything is on the same network make sense to use Npath?
- Even with Npath how can I control the outbound traffic if node, LB and server are in the same network: 10.233.203.X?
I do not understand well the entire flow:
CLIENT -> LB -> SERVER1 OR SERVER2 -> LB -> CLIENT
or using Npath:
CLIENT -> LB -> SERVER1 or SERVER 2-> CLIENT
Thanks for you support
Mac