TX/Rx Different Rate Show in Tunnels

RouterOS General
1

Hi Dear Friends I run IpIP tunnel But on local Router (TX router) Show TX rate live by winbox For example 400 M same time in remote router (RX router) see RX rate this is 387M


400-387=13
in this case we have 13M Difference

I test on EOIP tunnel with mtu 1500 Difference is worse

Can you explain to me ???

2

The tunnel encapsulates the packets. This creates a little overhead, due to the extra header and whatnot. If the MTU of the tunnel is too large, the router will have to fragment the “outer” package (the one created by the tunnel). This furthers the inefficiency of the process.

Solution is simple: use a smaller MTU inside the tunnel.

3

I use 1480 for IPIP MTU


Are you suggest MTU For IPIP For reduce Overhed???

4

You have to find out what is the MTU of your connection, between servers. Then You can subtract the IPIP overhead from that value.

EoIP has the same problem - as any tunnel that encapsulates one packet inside the other.

5

My Tunnel Over ethernet PORT On my switch my switch MTU IS 1500

But when RUN tunnel WITH mtu 1480 but have problem

6

For Example I tested and My connecetion MTU is 1450

Which MTU size set on IPIP or GRE tunnel set ???


THX

7

If I’m not mistaken, 1416 bytes should be enough. In doubt, try 1400.

But remember: There will always be a little loss, due to the encapsulation.

8

IP tunnel overhead is 20 bytes this is true???


and gre 24 ???

9

I believe so.