[squid-users] ACL with a non-contiguous mask - using multiple outgoing addresses

[Alex Rousskov]

On 7/16/23 08:03, Scott wrote:
> Hi all,
> 
> I have four IPv4s that I use for outgoing source addresses to origin servers.
> I currently have them used randomly, but this sometimes causes issues for
> certain sites that get confused if your source changes for various resources.
> For these sites I have an exception to the random IPs.
> 
> I decided to create the following acls which should match on the 2 low-order
> bits in the client addresses:
> 
> acl tm_src_v4_00 src 10.0.0.0 255.0.0.3

The above adds two IP addresses to the tm_src_v4_00 ACL: 10.0.0.0 and 
255.0.0.3.

Try this (untested but matching the documented syntax) instead:

     acl tm_src_v4_00 src 10.0.0.0/255.0.0.3


HTH,

Alex.


> acl tm_src_v4_01 src 10.0.0.1 255.0.0.3
> acl tm_src_v4_10 src 10.0.0.2 255.0.0.3
> acl tm_src_v4_11 src 10.0.0.3 255.0.0.3
> 
> tcp_outgoing_address 10.1.22.21 tm_src_v4_00
> tcp_outgoing_address 10.1.22.22 tm_src_v4_01
> tcp_outgoing_address 10.1.22.23 tm_src_v4_10
> tcp_outgoing_address 10.1.22.24 tm_src_v4_11
> 
> However I did not get the behaviour I was after, rather all clients use the
> same outgoing address.
> 
> Is there a way to share multiple outgoing IPs while maintaining consistency
> per-source?
> 
> Follow-up: can I do the same for IPv6 clients?
> 
> Thanks,
> Scott
> 
> PS: As an aside, the following ACL generated the following warning:
> 
> acl tm_src_11 src 0.0.0.3 0.0.0.3
> 
> Configuration for squid passes.
> 2023/07/15 23:38:40| WARNING: (B) '0.0.0.3' is a subnetwork of (A) '0.0.0.3'
> 2023/07/15 23:38:40| WARNING: because of this '0.0.0.3' is ignored to keep splay tree searching predictable
> 2023/07/15 23:38:40| WARNING: You should probably remove '0.0.0.3' from the ACL named 'tm_src_11'
> 
> Could someone please explain what the issue is with that ACL?  Thanks.
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