HI san2roy
since your WAN is /30 I guess 125.20.xx.31/30 is you ISP GW while
125.20.xx.32/30 is your WAN right?
can your ISP change your /30 to let say /29
to allow your Squid Box Wan be on the same subnet with your Mikrotik WAN?
or split your /30 to (2) /31 subnet
then we can use private IP on your Squid box LAN to route your clients public IP
but be sure you have the appropriate kernel and iptables on your centos 6.6
Kernel >=Linux Kernel 2.6.37
iptables >= iptables 1.4.10
http://wiki.squid-cache.org/Features/Tproxy4
Rgds
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