danb at zu
Jun 28, 2008, 9:22 AM
Post #2 of 2
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Re: [lvs-users] LVS Setup interfering with connection to other server?
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Ah damn nevermind. I should have spotted this much much earlier but I've
been banging my head on the problem too long. I just realized that when I
do this:
# ip addr sh lo
inet 216.94.150.110/25 brd 216.94.150.127 scope global secondary lo:110
inet 216.94.150.111/25 brd 216.94.150.127 scope global secondary lo:111
inet 216.94.150.114/25 brd 216.94.150.127 scope global secondary lo:114
inet 216.94.150.122/25 brd 216.94.150.127 scope global secondary lo:122
inet 216.94.145.3/26 brd 216.94.145.63 scope global secondary lo:003
inet 216.94.145.4/26 brd 216.94.145.63 scope global secondary lo:004
inet 216.94.145.5/26 brd 216.94.145.63 scope global secondary lo:005
inet 216.94.145.6/26 brd 216.94.145.63 scope global secondary lo:006
I should be having the network mask of /32 on everything. :P
___________________________________________________
Dan Brown
danb[at]zu.com
> -----Original Message-----
> From: lvs-users-bounces[at]linuxvirtualserver.org [mailto:lvs-users-
> bounces[at]linuxvirtualserver.org] On Behalf Of Dan Brown
> Sent: Saturday, June 28, 2008 09:11
> To: 'LinuxVirtualServer.org users mailing list.'
> Subject: [lvs-users] LVS Setup interfering with connection to other
> server?
>
> I have a server which I recently migrated a number of sites to and
> subsequently could not connect to a mail list server running mailman
> after
> doing the move. The problem appears to be caused by the new server
> although I can't figure out why. I discovered that when the new server
> is
> up and running:
>
> 1. The maillist server itself cannot reassign itself it's IP address.
> I
> restarted the network interfaces and I get the following:
> [root[at]iris rc.d]# /etc/init.d/network restart
> Shutting down interface eth0: [ OK ]
> Shutting down interface eth1: [ OK ]
> Shutting down loopback interface: [ OK ]
> Setting network parameters: [ OK ]
> Bringing up loopback interface: [ OK ]
> Bringing up interface eth0: Error, some other host already uses
> address
> 216.94.145.62.
> [FAILED]
> Bringing up interface eth1: [ OK ]
>
> Awesome eh? As it happens, the router says the MAC address it is the
> same
> as the server it is supposed to be, even after rebooting the router.
> Why
> would the new server be arp'ing for a server it has no configuration
> for?
>
> If I assign the interface using:
>
> ifconfig eth0 216.94.145.62 netmask 255.255.255.192 broadcast
> 216.94.145.63
> up
>
> it comes up normally.
>
> 2. The new server is part of the LVS system and has a couple of hundred
> IPs
> on its loopback interface (via DR for 216.94.150.0/25, and
> 216.94.145.0/26,
> the real IP is on the network block 209.167.162.80/30). It cannot
> connect
> to the server in problem 1 when those IPs are in place. When the
> address is
> assigned, no other servers (almost all part of the LVS) have any
> problems at
> all connecting to it. Just this one server. Originally it had some
> arptable rules about not responding to that IP address but that has
> since
> been removed. It has never had a loopback entry for the IP itself.
> The IP
> of the server itself is on a different network but it's all behind the
> same
> router. The server is: 209.167.162.84, the maillist server is
> 216.94.145.62.
>
> For some reason, it appears the server is connecting to itself. A
> tcpdump
> on the loopback address shows:
> 08:15:24.808782 IP maillists.zu.com.53070 > maillists.zu.com.smtp: S
> 1356583672:1356583672(0) win 32767 <mss 16396,sackOK,timestamp 50190198
> 0,nop,wscale 2>
> 08:15:24.909467 IP maillists.zu.com.smtp > maillists.zu.com.53070: R
> 0:0(0)
> ack 1356583673 win 0
>
>
> None of the other LVS real servers I've setup are having this problem,
> and
> there are no problems connecting to any of the sites on the server...
> so
> what did I miss this time?
>
> ___________________________________________________
> Dan Brown
> danb[at]zu.com
>
>
>
> _______________________________________________
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