Hi all,
I have server pppoe in routerboard rb1000 5.24 it’s all ok, only one problem:
My client-ppp is connected to internet without problems, but when tried download big file, download started for a few seconds and freeze
my pppoe-server mtu/mru:1492 and change mss to 1448 with firewall mangle
Idea?
I found that the best performance/compatibility is when mtu is set to 1360. You should do:
/ip/firewall/mangle
add action=change-mss chain=forward comment=“MTU change to 1360” disabled=no new-mss=1360 passthrough=yes protocol=tcp tcp-flags=syn tcp-mss=1361-65535
also, RB1000 performance is best with ROS4.17 . V5 eats a lot of CPU power
hi krajnalic,
i change mangle for change-mss in 1360, add browsing site is very very fast.
But impossibile download file, freeze download and fluctuating bandwidth.
My test is with router lan directaly connected to routerboard Mikrotik and connection pppoe 1480 mtu and mru (tried wiht 1492 same result)
i don’t know.
I think problem is ip fragment…but now i don’t know.
You have to add the rule to pppoe server, not client
Resolved
Add policy nat 
Could you explain what you did.
Thanks