Page 1 of 1
What is the Max MTU/MRT of EOIP over PPPoE connection ?
Posted: Mon Jun 28, 2010 2:39 pm
by 200120022003
I make a EOIP over PPPoE, there is a lot of packet loss.
I googled. This is a issue relate to MTU/MRU (Like VPN over PPPoE).
What is the Max MTU/MRU of EOIP ? Thank you !
Re: What is the Max MTU/MRT of EOIP over PPPoE connection ?
Posted: Mon Jun 28, 2010 3:09 pm
by mrz
If MTU of the physical interface is 1500 then
1500
- 8 (pppoe+ppp header)
- 28 (gre header)
- 14 (eth header)
=1450
Re: What is the Max MTU/MRT of EOIP over PPPoE connection ?
Posted: Mon Jun 28, 2010 6:06 pm
by 200120022003
How about the header size of IPIP tunnel ? Thx !
The maximum packet size in IPIP Tunnel is 1480 bytes, 20 bytes are overhead
Is this corrent ? Thx !
Re: What is the Max MTU/MRT of EOIP over PPPoE connection ?
Posted: Fri Jul 02, 2010 10:19 pm
by Chupaka
yep. so, in case of PPPoE, MTU will be 1500 - 8 - 20 = 1472
Re: What is the Max MTU/MRT of EOIP over PPPoE connection ?
Posted: Mon Feb 06, 2012 6:22 pm
by ab130kd
Dear Chupaka,
I have a RB1100AHx2 as concentrator PPPoE and a lot of tunnel EOIP over a big ospf network. Mikrotik set by default 1480 as MTU. Is it correct use 1480? If is not correct, how much must be and where must I change MTU, because on different message read different MTU. Where must I change the MTU, in pppoe server or on every EOIP interface?
Now pings, going from a simple ospf network to ospf + EOIP network + PPPoE concentrator, increase a lot and I don't understand where I'm wrong.
Thanks in advance,
Carlo