How can I masquerade two different subnets using two different external IP addresses for them?
Use /ip firewall nat rule with chain=srcnat action=nat, specify the to-src-address argument value. It should be one of the router’s external addresses. If you use action=masquerade, the to-src-address is not taken into account, since it is substituted by the external address of the router automatically. I cannot surf some sites when I use PPPoE. Use /ip firewall mangle to change MSS (maximum segment size) to a value less 40 bytes your connection MTU.
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