EOIP - how much overhead ?

How much overhead adds the EOIP interface to the connection ?
Meaning, for a 10 mbit guaranteed channel, when put an eoip on it, as the only traffic what would be the transfer of it ? ( it’s a multihop network with different providers, not wireless link, so no wds argue ).
I don’t have yet control over the other end, i am considering now investing in a mt system for that sole purpose.

Will it worth it ?

If it’s anywhere, feel free to direct there. Only thing I found was in a post long… time ago, saying something about 28 bytes… (http://forum.mikrotik.com/t/pppoe-put-inside-eoip/549/8)

I don’t know the exact EoIP packet header length (it could be easily determined by tcpdump or so). The overhead impact depends deeply on how long are the real packets - it means if you are transmitting mostly full sized packets the EoIP headers will consume about 2-3% of the traffic. In case most of the traffic are short packets (VoIP) the impact will be much more significant…

If you are using RouterBoards to do the EoIP the first thing I would check is whether the CPU is fast enough to be able to encapsulate all the data on the desired speed. It looks like the 264Mhz CPU is able to forward something about 10-15mbps (in one direction) before it reaches 100% of load…

Regards
D. Toman

Yes indeed.
But someone has to know if all of the overhead is that 28 bytes. If i missed this somewhere, i’ll look again.
And for what i am establishing - a bridge between 2 remote locations, to act as a private lan, than that’s about to be found out.

thks.

I measured ICMP echo packet size on an EoIP tunnel and found it to be 8 bytes larger than the same packet before it goes into the tunnel.

I claim no special insight on this issue other than that is what I measured.