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RE: Squid and Selecting Gateways

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Thanks Henrik however this is squid running on a Windows 2000 box and AFAIK
you cannot set windows routing tables like in Linux. Also with your solution
(which I adore) there is still the problem that the second gateway requires
connection to an upstream proxy. How will your solution work with this?

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James Collins
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Cairns School of Distance Education
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> -----Original Message-----
> From: Henrik Nordstrom [mailto:henrik@xxxxxxxxxxxxxxxxxxx] 
> Sent: Monday, 13 March 2006 7:42 PM
> To: James Collins
> Cc: squid-users@xxxxxxxxxxxxxxx
> Subject: RE:  Squid and Selecting Gateways
> 
> mån 2006-03-13 klockan 16:27 +1000 skrev James Collins:
> > Thanks for the pointer Mark. Unfortunally the printed manual I have 
> > doesn't explain the tcp_outgoing_address completely. It 
> comments that 
> > it only overrides the systems default gateway and doesn't 
> mention you 
> > can use it under acl's.
> 
> Squid has no control over which gateway to use. All it can 
> say is to ask the OS to "please use this specific source 
> address when I make connections". 
> 
> Which gateway or NIC to use is a business of the routing 
> settings in your OS. Multihomed routing like you described 
> generally requires policy routing to be configured to route 
> the traffic to the correct gateway(s) depending on source 
> address or whatever criterias you have other han just destination.
> 
> Please note that there is an alternative and much easier 
> solution to your original problem. Simply configure your OS 
> to route the IP addresses of the site in question via the 
> second gateway and leave tcp_outgoing_address alone. Your OS 
> and Squid will then do what they should automatically.
> 
> So you will have
> 
> NIC 1:
> 
> ip = x.y.z.a/mask
> default gateway = x.y.z.b
> 
> NIC 2:
> 
> ip = x.y.y.a/mask
> no default gateway
> 
> Static routes:
> 
> ip.of.site via x.y.y.b
> 
> 
> 
> x.y.z = ISP1
> x.y.y = ISP2
> 
> 
> 
> Hmm... upon reading your question again it seems these two 
> NICs are to be connected to the same Ethernet? If so then no 
> new NIC is needed. Just assign a second IP address to the 
> existing one.
> 
> Additionally routing of requests to parents is done via the 
> cache_peer + cache_peer_access directives. You only need to 
> play the games with routing if you need different IP level 
> routers, or different source addresses to be used for the traffic.
> 
> 
> 
> 
> Regards
> Henrik
> 

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