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Hi,

thanks for the mail. I used ethereal now to trace the whole scenario.
remember I start sctpmultiserver on machineA (192.168.220.11, 192.168.221.12)
and sctpterminal on machineB (192.168.220.7, 192.168.221.8).

>are both addresses exchanged during the association setup?
yes, both addresses are exchanged in an init chunk (addresses of A) and
initACK (addresses of B).

then after exchanging an SCPT cookie packet, another init/initACK are
exchanged. then some hearbeats/acks and finally data, transmitted from A's
192.168.220.11 to B's 192.169.220.7, which is the primary address. but after
taking interface eth1 down on machine B (which is 192.168.220.7) only
heartbeats are received by B's second interface, originating from A's second
interface.

Thanks for helping.

Best regards,
Patrick



________________________________

From: Michael Tuexen
[mailto:Michael.Tuexen AT micmac.franken.de]
Sent: Tue 10/19/2004 7:21 PM
To: Stüdi, Patrick
Cc:
discussion AT sctp.de
Subject: Re: [SCTP-Discussion] Multihoming



Hi,

are both addresses exchanged during the association setup? Where
does the terminal client send the DATA packets? You could trace
the traffic on both interfaces to see what is happening. This
would help to understand what is going on.

Best regards
Michael

On Oct 19, 2004, at 14:16 Uhr, Stüdi, Patrick wrote:

> Hi everyone,
>
> I first want to apologize for my last post in case it sounded a bit
> harsh. This is maybe because I'm somehow desperate with that
> multihoming issue. Is there really no-one having an idea? Any help
> would be appreciated. I have again attached my setup below.
>
> Best Regards,
>
> Patrick
>
> ----------------------------- SETUP
> -----------------------------------------------------
>
> I have two laptops, both with a WLAN card (which is configured to be
> in 'ad hoc' mode) and a Bluetooth dongle.
>
> I configured the network to looks as follows on machine A:
>
>
>
>> ifconfig
>
> bnep0 Link encap:Ethernet HWaddr 00:10:DC:E9:6C:B8
>
> inet addr:192.168.221.12 Bcast:192.168.221.255
> Mask:255.255.255.0
>
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>
> RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>
> TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
>
> collisions:0 txqueuelen:100
>
> RX bytes:116 (116.0 b) TX bytes:0 (0.0 b)
>
>
>
> eth1 Link encap:Ethernet HWaddr 00:02:2D:7B:89:B4
>
> inet addr:192.168.220.11 Bcast:192.168.220.255
> Mask:255.255.255.0
>
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>
> RX packets:301 errors:0 dropped:0 overruns:0 frame:0
>
> TX packets:57 errors:0 dropped:0 overruns:0 carrier:0
>
> collisions:0 txqueuelen:100
>
> RX bytes:45271 (44.2 Kb) TX bytes:9257 (9.0 Kb)
>
> Interrupt:11 Base address:0x100
>
>
>
> The configuration is the same on machine B. The route on A and B look
> like:
>
>
>
> Kernel IP routing table
>
> Destination Gateway Genmask Flags Metric Ref
> Use Iface
>
> 192.168.221.0 * 255.255.255.0 U 0 0
> 0 bnep0
>
> 192.168.220.0 * 255.255.255.0 U 0 0
> 0 eth1
>
> 127.0.0.0 * 255.0.0.0 U 0 0
> 0 lo
>
>
>
> When testing, I can ping both interface without any problem. So I'm
> starting the sctpmultiserver on machine B (the example program):
>
>
>
> ./sctpmultiserver
>
>
>
> Right after, I start the terminal program on machine A to connect to
> both interfaces.
>
>
>
>> ./sctpterminal 192.168.220.7:echo 192.168.221.8:echo
>
>
>
> Great. So echoing works fine. But now I'm taking down interface eth1.
>
>
>
>> ifdown eth1
>
>
>
> The routing entry on machine B for eth1 disappears, on machine A the
> table keeps consistent. But the example terminal program doesn't
> switch to the secondary address. Interface two (192.168.221.8), is
> pingable without any problems. I even tried to get rid of the 'eth1'
> entry in A's routing table but this doesn't help either.
>
> So, if anyone has a clue, please let me know. Any help would be
> appreciated.
>
> Thanks a lot.
>
> Patrick
>
> _______________________________________________
> discussion mailing list
> discussion AT sctp.de
> http://www.sctp.de/mailman/listinfo/discussion
>

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• [SCTP-Discussion] Multihoming, Stüdi , Patrick, 10/19/2004
  • Re: [SCTP-Discussion] Multihoming, Michael Tuexen, 10/19/2004
  • <Possible follow-up(s)>
  • Re: [SCTP-Discussion] Multihoming, Stüdi , Patrick, 10/20/2004
    • Re: [SCTP-Discussion] Multihoming, Michael Tuexen, 10/20/2004
  • Re: [SCTP-Discussion] Multihoming, Stüdi , Patrick, 10/22/2004
    • Re: [SCTP-Discussion] Multihoming, Michael Tuexen, 10/22/2004

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