I have two site, Site-A and Site-B where I have configured ipsec vpn. In Site-A I have ADSL pppoe connection connected to Mikrortik eth3 port which used to browse internet. I have added default route 0.0.0.0/0 gateway 192.168.5.1 which is adsl lan ip. But I am not able to reach internet from LAN side of SITE-A router. What might be wrong? IPSEC vpn is working fine.
If you have pppoe on mikrotik, that will indicate that the adsl modem/router is in bridge mode (confirm this as it is important)
Then you can’t point default gateway to the adsl modem/router IP, that IP is then only for management purposes. You should get IP/gateway on the mikrotik pppoe interface from supplier and with mikrotik default config, it will automatically add a default route