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Re: Load balancing WITHOUT parents over multiple WAN connections

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Jon DeLee wrote:
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Hi All,

I'm using Squid 3.0. STABLE 8 as my main cache, and I have two other 2.7 caches set up, one on each WAN connection. The only reason we have multiple proxy servers is to load balance; in reality I only need the one 3.0 server, which has access to both WAN links. I don't want any ACLs that force one group of users to one outgoing IP; I just want Squid to see that it has two paths to the internet and use them in a weighted round-robin fashion. I have tried setting up one direct and one parent, but no weighting occurs because Squid prefers direct routes if possible.

I have tried to force squid to use an IP address on the machine and set up multiple weighted routes from that IP, but strange things happen with web sites that check source IP address, so it needs to be something that Squid can control.


Any suggestions?

For two links, I would think that an external_acl_type that makes a hash of the domain (or perhaps just the top level domain) and returns true for half (or whatever distribution you want) and false for the rest, associated with tcp_outgoing_address would work.

external_acl_type domainhash %DST /my/helper/scripts/domainhash
acl domainhash external domainhash
tcp_outgoing_address 192.168.18.45 domainhash
tcp_outgoing_address  10.32.97.43 !domainhash

I can't make any promises regarding the fail-over capability of this setup.


Thanks,

Jon DeLee

Chris


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