[B.A.T.M.A.N.] ttcrc value

[B.A.T.M.A.N.] ttcrc value

[ajeet singh]

Hello all,
We are getting the same value of ttcrc always even after restarting the nodes.

Please check the bellow TCPDUMP log,

Log 1
09:05:17.118462 BAT f4:7b:5e:88:7d:a0: OGM IV via neigh
f4:7b:5e:88:7d:a0, seq 2246235905, tq 255, ttvn 1, ttcrc 15939, ttl
50, v 14, flags [...F.], length 26
09:05:17.118764 BAT f4:7b:5e:88:7d:a0: OGM IV via neigh
f4:7b:5e:88:7d:a0, seq 2246235905, tq 255, ttvn 1, ttcrc 15939, ttl
50, v 14, flags [...F.], length 26

Log 2 ( After restart)
 00:12:29.480397 BAT f6:7b:5e:88:7d:a0: OGM IV via neigh
aa:aa:03:00:00:00, seq 2864163091, tq 255, ttvn 1, ttcrc 15939, ttl
2, v 14, flags [.....], length 26
 00:12:29.520254 BAT f4:7b:5e:88:7d:a0: OGM IV via neigh
aa:aa:03:00:00:00, seq 31648486, tq 255, ttvn 1, ttcrc 15939, ttl 50,
v 14, flags [...F.], length 26
 00:12:32.488390 BAT f6:7b:5e:88:7d:a0: OGM IV via neigh
aa:aa:03:00:00:00, seq 2864163092, tq 255, ttvn 1, ttcrc 15939, ttl
2, v 14, flags [.....], length 26
 00:12:32.536432 BAT f4:7b:5e:88:7d:a0: OGM IV via neigh
aa:aa:03:00:00:00, seq 31648487, tq 255, ttvn 1, ttcrc 15939, ttl 50,
v 14, flags [...F.], length 26


 Is it normal operation?

 Thanks
 Ajeet

Re: [B.A.T.M.A.N.] ttcrc value

[Antonio Quartulli]

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On Tue, Jul 02, 2013 at 11:28:48AM +0530, ajeet singh wrote:
> Hello all,
> We are getting the same value of ttcrc always even after restarting the nodes.
> 
> Please check the bellow TCPDUMP log,
> 
> Log 1
> 09:05:17.118462 BAT f4:7b:5e:88:7d:a0: OGM IV via neigh
> f4:7b:5e:88:7d:a0, seq 2246235905, tq 255, ttvn 1, ttcrc 15939, ttl
> 50, v 14, flags [...F.], length 26
> 09:05:17.118764 BAT f4:7b:5e:88:7d:a0: OGM IV via neigh
> f4:7b:5e:88:7d:a0, seq 2246235905, tq 255, ttvn 1, ttcrc 15939, ttl
> 50, v 14, flags [...F.], length 26
> 
> Log 2 ( After restart)
>  00:12:29.480397 BAT f6:7b:5e:88:7d:a0: OGM IV via neigh
> aa:aa:03:00:00:00, seq 2864163091, tq 255, ttvn 1, ttcrc 15939, ttl
> 2, v 14, flags [.....], length 26
>  00:12:29.520254 BAT f4:7b:5e:88:7d:a0: OGM IV via neigh
> aa:aa:03:00:00:00, seq 31648486, tq 255, ttvn 1, ttcrc 15939, ttl 50,
> v 14, flags [...F.], length 26
>  00:12:32.488390 BAT f6:7b:5e:88:7d:a0: OGM IV via neigh
> aa:aa:03:00:00:00, seq 2864163092, tq 255, ttvn 1, ttcrc 15939, ttl
> 2, v 14, flags [.....], length 26
>  00:12:32.536432 BAT f4:7b:5e:88:7d:a0: OGM IV via neigh
> aa:aa:03:00:00:00, seq 31648487, tq 255, ttvn 1, ttcrc 15939, ttl 50,
> v 14, flags [...F.], length 26
> 
> 
>  Is it normal operation?

The TTCRC is computed based _only_ on the address addresses listed in the local
table. There is no randomness involved, therefore, if the addresses in the table
are always the same, then also the TTCRC will stay the same.

Is this the case?

cheers,

-- 
Antonio Quartulli

..each of us alone is worth nothing..
Ernesto "Che" Guevara

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