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From: "José Luis Domingo López" <lartc@24x7linux.com>
To: lartc@vger.kernel.org
Subject: Re: [LARTC] Iptables, SNAT/MASQ,  Multiple gateways
Date: Sun, 29 Sep 2002 22:45:33 +0000	[thread overview]
Message-ID: <marc-lartc-103333960613784@msgid-missing> (raw)
In-Reply-To: <marc-lartc-103332395202631@msgid-missing>

On Sunday, 29 September 2002, at 11:24:03 -0700,
Simon Matthews wrote:

> I have a dual-homed firewall. It has 2 Internet connections, provided by
> different ISPs (each with an associated IP address). The 2 Internet
> connections are connected to the same physical interface. The 2 Internet
> connections do NOT have equal bandwidth
> 

> How do I configure the SNAT/MASQ and ensure sharing of the gateways with
> the correct ratio of usage and with the correct source IP address? 
> 
ip route add default nexthop via $CONN1_IP dev $ETHX weight $X \
                     nexthop via $CONN2_IP dev $ETHX weight $Y

weight(s) are the relative bandwidths of the connections. If the first
is a 2 Mbps line and the second a 512 Kbps one, $=4 and $Y=1, for example.
What matters is the ratio, not the actual bandwidth.

> I know how to use the 'ip' commands to configure gateway sharing according
> to my defined ratios and ensure that packets go out of the correct gateway 
> according to their source address.
> 
The above defines routing. And SNAT/MASQ is something done afterwards,
so you could SNAT/MASQ traffic going to each connection differently.
What I don't know right now is how to determine to which Internet
connection are packets going in your setup with only an ethernet card
for both. With a card for each Internet connection it is simple.

Hope this helps.

-- 
Jose Luis Domingo Lopez
Linux Registered User #189436     Debian Linux Woody (Linux 2.4.19-pre6aa1)
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  reply	other threads:[~2002-09-29 22:45 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-09-29 18:24 [LARTC] Iptables, SNAT/MASQ, Multiple gateways Simon Matthews
2002-09-29 22:45 ` José Luis Domingo López [this message]
2002-09-30  5:18 ` Don Cohen
2002-09-30  7:06 ` Simon Matthews
2002-09-30 15:55 ` Don Cohen
2002-09-30 17:05 ` Michael T. Babcock
2002-09-30 18:11 ` Jose Luis Domingo Lopez
2002-09-30 19:23 ` Julian Anastasov
2002-09-30 19:24 ` Simon Matthews
2002-09-30 19:26 ` Simon Matthews
2002-09-30 19:41 ` Greg Scott
2002-10-01  4:12 ` William L. Thomson Jr.

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