Re: [B.A.T.M.A.N.] Problems with Gateway-Selection without option -g

[Michael Rack <michael.rack@rsm-freilassing.de>]

Am 06.09.2009 17:11, schrieb Marek Lindner:
>
>
> I don't understand why you have the feeling the gate0 interface is a problem.
> As Elektra explained choosing a default gateway by "inserting a default route"
> is meaningless (in a mesh). If each client should be able to choose its own
> gateway there is no way around the tunnel mechanism.
>

Sorry but i had not the right view of the tunneling-interface.

Now, the reason for the tunneling-interface is totaly clear. There is no 
other solution to route internet-traffic through a specified gatway. The 
only solution will be to lable a tcp/ip-packet how MPLS does, but that 
is to fancy.

One question: Will the P2P-Interface (gate0) shows up in a traceroute? 
The P2P-Interface have a private ip-address 169.x.x.x assigned to it. I 
use only public ip-addresses and do not want to show a private 
ip-address in a traceroute.

When using the tunneling interface, the MTU is set to a lower value then 
1500 bytes (1431 bytes). B.A.T.M.A.N have in addition to the NAT-Helper 
set the TCPMSS Flag to something like 1371 bytes (1431 bytes - 20 Bytes 
of MAC-Address and - 40 Bytes of TCP/IP Header). I found nothing about 
TCPMSS on my firewall-rules (iptables) in the table "mangle".

Without TCPMSS, packages that transport more then 1371 bytes will be 
silently dropped in my case.

Now i will give B.A.T.M.A.N a second try and will use the little tricky 
solution to add two /1 subnets. Thanks to Elektra.

> I suggest to use the --policy-routing-script [1] option to modify the routing
> tables on the fly.

Currently i have my own policy-routing-script, because B.A.T.M.A.N does 
not support HOST-Routes xxx.205.12.4/32. But why does B.A.T.M.A.N not 
fully support Host-Routes? A mash with only Host-Addresses is easier to 
administrate then complete networks. A second goal is, that the ad-hoc 
mobile user is free to change his position across the net.

I use only host-addresses to safe ip-addresses.

Michael.