From: George Georgalis <georgw@galis.org>
To: netfilter@lists.samba.org
Subject: not loadbalancing but 2 ISPs
Date: Mon, 17 Jun 2002 23:27:00 -0400 [thread overview]
Message-ID: <20020617232700.A3401@trot> (raw)
I'm going to be migrating some servers from one ISP to another at the
same location.
Does this scenario hold water (simplified syntax for clarity). The idea
is for the server to respond (all the way to the client) regardless of
whether the request went to the IP on ISP1 or ISP2.
T1a_host01=host ip on ISP 1
T1b_host01=host ip on ISP 2
DMZ_host01=host ip on DMZ
EXT_T1a=external interface for ISP 1
EXT_T1b=external interface for ISP 2
INT_DMZ=internal interface for DMZ
nat PREROUTING --dst $T1a_host01 DNAT $DMZ_host01
nat PREROUTING --dst $T1b_host01 DNAT $DMZ_host01
INPUT -i $EXT_T1a -d $DMZ_host01 -j ACCEPT
INPUT -i $EXT_T1b -d $DMZ_host01 -j ACCEPT
nat -A POSTROUTING -s $DMZ_host01 -o $EXT_T1a -j SNAT --to-source $T1a_host01
nat -A POSTROUTING -s $DMZ_host01 -o $EXT_T1b -j SNAT --to-source $T1b_host01
FORWARD -i $INT_DMZ -o $EXT_T1a -m state --state ESTABLISHED,RELATED -j ACCEPT
FORWARD -i $INT_DMZ -o $EXT_T1b -m state --state ESTABLISHED,RELATED -j ACCEPT
If this wouldn't work, why? I'm concerned about those POSTROUTING
lines, is there a workaround? Would the system also work for high
availability, if I could get DNS to behave?
// George
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next reply other threads:[~2002-06-18 3:27 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-06-18 3:27 George Georgalis [this message]
2002-06-18 8:16 ` not loadbalancing but 2 ISPs Antony Stone
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