you can use "ip route" with "src" parameter to effect source ip of
interface.
you could add higher metric default route, or change the default.
Alternatively you can set $APPLICATION to bind to the floating IP,
presumign it starts after the IP is bound.
Trent
On 18/03/2009, at 10:40 PM, zhoupaul wrote:
Thanks boyack. But this still didn't work. After I run this script,
I checked the routing table, the column device is still 0, I think
it should be 0:0, is that correct?
Date: Tue, 10 Mar 2009 19:51:53 -0600
From: [email protected]
To: [email protected]
Subject: Re: [Linux-HA] urgent dhcp problem
I may be wrong here, but I think what is happening is that "normal"
traffic is sent from a client to the floating IP (10.3.254.113), and
then your server knows to send back packets that are FROM that same
floating IP. But if your server STARTS the conversation, it sends
it out
on the native interface of 10.3.254.111. DHCP uses broadcasts to
start
the conversation, asking the entire network for a response, and
then the
server initiates the conversation from its native interface.
I've had this trouble in the past, and have this script:
#################### SNIP ######################
#!/bin/sh
#
# Startup script to fake routing to a shared interface
#
# Use: Routing {start|stop}
#
# Licence: GPL
# Source function library.
. /etc/ha.d/shellfuncs
Rstart () {
ha_log "info: $0: Starting"
sleep 5
/sbin/route del default
/sbin/route del -net 10.3.254.0/24 eth0
/sbin/route add -net 10.3.254.0/24 eth0:0
/sbin/route add default gw 10.3.254.254
}
Rstop () {
ha_log "info: $0: Shutting down"
sleep 5
route del default
route del -net 10.3.254.0/24 eth0:0
route add -net 10.3.254.0/24 eth0
route add default gw 10.3.254.254
}
# See how we were called.
case "$1" in
start)
Rstart
;;
stop)
Rstop
;;
*)
echo "Usage: $0 {start|stop}"
exit 1
esac
exit 0
#################### SNIP ######################
This just simply tears down your normal route out eth0 and addes a
new
route that goes out the floating address eth0:0. Doing that will
remove
your normal default route (gateway), so it adds that back in.
I put this script in ha.d/resource.d as a file called 'Routing' (but
that is probably not a very good name).
I add this to my haresources immediately after the IP address,
before I
start any services (yours would be 'node1-name 10.3.254.113 Routing
httpd sendmail dhcpd nagios')
Note that I edited the file to use the addressed you supplied, but I
guessed on your netmask (assuming it was a 24 bit netmask, or
255.255.255.0), and I guessed on your gateway, assuming it was
10.3.254.254. You may need to change the values to match your
network.
Good luck,
-Ty!
zhoupaul wrote:
I have set up two nodes HA server and the haresources file like:
node1-name 10.3.254.113 httpd sendmail dhcpd nagios. Two nodes
have a static IP address as: 10.3.254.111 10.3.254.112. Everything
seems ok except when I run ipconfig on windows client, I got dhcp
server 10.3.254.111. It should be the virtual IP 10.3.254.113,
what is wrong with this, how can I resolve this problem? I need to
solve this problem as soon as possible, thanks for any solutions
and suggestions.
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--
-===========================-
Ty! Boyack
NREL Unix Network Manager
[email protected]
(970) 491-1186
-===========================-
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See also: http://linux-ha.org/ReportingProblems
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_______________________________________________
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See also: http://linux-ha.org/ReportingProblems
_______________________________________________
Linux-HA mailing list
[email protected]
http://lists.linux-ha.org/mailman/listinfo/linux-ha
See also: http://linux-ha.org/ReportingProblems
