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Old 05-15-2008, 03:43 PM   #1
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Registered: May 2008
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How config 2 isp connection,one for upload and one for download

Hello there,

I have three lancard in my fedora core 3 and i have 2 isp's connection(one offer good rate for download only). So can you people help me to configure routing on linux server like 2 Lancard for 2 isp connection and one other lancard connected to my laptop from which i gonna browse.
if i browse form laptop download bandwidth consume from one isp and upload consume from another or any other way to use my linux box configure like consume one isp's upload bandwidth and other isp's download bandwidth.Or any other way I can achieve this please suggest.

Thanks in advanced

Last edited by hellofrommunir; 05-15-2008 at 05:05 PM.
Old 05-18-2008, 09:39 AM   #2
Registered: Mar 2006
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I don't think you can do such thing ...
every tcp connections, uses both directions (every packet you receive you have to send ack).

beside that, routing table uses network ip's to differ one route from another, unless you have specific ip's, you can't divide download and upload throw 2 nics ...
Old 05-20-2008, 08:34 AM   #3
Registered: Apr 2004
Distribution: redhat 9.0, fc4, redhat as 4
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Dear, this is simple you can do this via virtualization, or if you have two systems.

i am defining this using two systems. suppose you have systemA (nic1 isp1, nic2 lan ip= and systemB (nic1 isp2, nic2 lan ip=

now configure squid on both server, create a squid cache rule on systemA.

cache_peer parent 8080 3130 default no-query

All your web traffic will be forwarded to ISP2 and all Stmp,pop3... will be using ISP1.

using this web is on ISP2 and other traffic on ISP1.

Requirements:-- squid on both, iptables on both systems.
default gateway : SystemA for all nodes on your network.
iptables : to nat other protocols.

Old 05-20-2008, 10:56 AM   #4
Registered: Jun 2005
Location: Odenton, MD
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While I'm not sure how to do it, you can do load balancing on your connection and might help you out. You should be able to tie the NICs together virtually and use it like it's one connection.
Old 05-20-2008, 02:15 PM   #5
Registered: Jun 2007
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that is an asymmetric routing - but good only if your ISPs support it. This kind of setup typically if you have a DVB-IP connection. You use your dial-up 33600bps analog modem to ISP-A for internet request and use a broadband wireless receiver from ISP-B for the internet reply.

search around.

Old 01-12-2009, 05:42 PM   #6
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Hi, I really rally really need to do this also as a experiment, did anyone had any luck?
windows versions is welcome

Last edited by joeaboy111; 01-12-2009 at 05:45 PM.


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