Hi,
can anyone help me with this problem ?
I have DSL line and I want setup mikrotik to optimal perfomance with this line. My provider say optimal MTU is 1452.
When I setup PPPoE client MTU to 1452 I must activate TCP MSS ? (this have result 1452MTU/1412TCP MSS), or I must set MTU on PPPoE to 1492 and TCP MSS have 1452 ..
What is correct ?
And next question is, I want interconnect over this DSL line other network via L2TP protocol. What is best MTU for L2TP over this line ? L2TP has 40 bytes overhead, when I set MTU on DSL to 1452(1412TCPMSS) is correct MTU value for L2TP 1412 (1452-40) or 1372 (1412-40) ??
Thanks a lot for solution 
/Tomi
- Edit : Now I checking original config file from provider to my modem (Alcatel speedtouch 510i_v4) and in ini files I found this :
apadd addr=10.0.0.138/8 intf=eth0 addroute=yes type=1
ifconfig intf=loop mtu=1500 group=local
ifconfig intf=eth0 mtu=1452 group=lan
ifconfig intf=pppoe mtu=1500 group=wan
rtadd dst=0.0.0.0/0 intf=eth0 metric=70
rtadd dst=224.0.0.0/4 intf=eth0
rtadd dst=255.255.255.255/32 intf=eth0
?!?! ETH=1452 and WAN=1500 ?
