I just checked, and it looks like RP filter is disabled on the Squid box.
root_at_squidproxy:~# cat /proc/sys/net/ipv4/conf/all/rp_filter
0
root_at_squidproxy:~# cat /proc/sys/net/ipv4/conf/eth0/rp_filter
0
root_at_squidproxy:~# cat /proc/sys/net/ipv4/conf/lo/rp_filter
0
root_at_squidproxy:~# cat /proc/sys/net/ipv4/conf/default/rp_filter
0
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