PPPoE problem

DDDD · September 23, 2006, 9:55am

I’ve set adsl modem recently.
Every seemed to be fine - PPPoE client is up/running, masquarading is set.
Then I noticed that a lot of sites didn’t work (among them HTTPS sites).
I don’t get what’s wrong with it.
I’ve tried to use WebProxy, same problem.
Can anyone help me to solve it?
I know that th answer is on the surface, but I can’t see it.
thanx in advance

marko_bg · September 23, 2006, 11:31am

try set:
MTU=1492
MRU=1492

DDDD · September 23, 2006, 2:27pm

Doesn’t work. (
I’ve tried to set IP Proxy, it helps. I guess all work only when connection is initiated by mikrotik.
Could it be that ISP doesn’t support forward or smth like that?

Stryker777 · September 23, 2006, 3:20pm

If your Mikrotik is connecting to your dsl via PPPoE have you tried modding your tcpmss in the mangle table? If not try this:

/ip firewall mangle add chain=forward protocol=tcp tcp-flags=syn action=change-mss new-mss=1452 comment="Syn MSS to 1452" disabled=no

marko_bg · September 23, 2006, 3:26pm

ask your provider for MTU and MRU setting

DDDD · September 24, 2006, 11:07am

Stryker777:

If your Mikrotik is connecting to your dsl via PPPoE have you tried modding your tcpmss in the mangle table? If not try this:
/ip firewall mangle add chain=forward protocol=tcp tcp-flags=syn action=change-mss new-mss=1452 comment="Syn MSS to 1452" disabled=no

Helped. thanx a lot.