Multi-homed routeing issue
Joseph T. Duncan
duncan at engr.orst.edu
Wed Aug 2 21:48:57 BST 2006
>> for the first packet:
>> data -> eth1 -(ipvs ballancer)- eth1 -> real server
>> subseqent packets would then do the following:
>> data -> eth0 -(ipvs ballancer)- eth0 -> real server
> do you have /32 on the VIP on the director and realservers?
> (you probably do or it wouldn't work).
Cant specifiy a /32 on the windows boxes.. it works just fine with /24,
windows creates two sets of routes (eth0 and lo) for the subnet.. but the
lo routes have no exit gateway device and windows automagicly sets a
fiarly high metric (weight) on that route, so everything goes over the
real interface anyway.
on the director I have it set up as a /24 on the vip. I went ahead and
tried setting the vip with /32 (and gave the machine a full reboot) and it
still had the same behavour as with /24 (so have reverted to /24 for the
> It would be simpler to have just one NIC with the VIP and
> unplug the other one (or put it on and administrative network)
I cant have one nic with the vip, or the traffic for doing the weight
tables gets blackholed on the realservers.
I started off with eth0 being the vip, and eth1 being a diffrent rip.
however all snmp and icmp then use vip as the return address, sence the
realservers also have the vip assigned to them, they dont reply ;p
If one were to setup RIP on eth0 and VIP on eth0:1, outbound traffic
(snmp -> realserver, icmp -> realserver) would the outbound traffic then
get the RIP set to the return address still?
> it's not breaking anything? If not you can leave it alone.
it isnt breaking anything, and I can leave it as it is. It would nice to
isolate traffic to a specific interface. (it throughs off stats gathering
stuff done on the switch)
Joseph T. Duncan Joseph.Duncan at orst.edu
1607 SW 49th St. APT 14
Corvallis, Or 97333
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