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Re: [SCTP-Discussion] Multihoming


Chronological Thread 
  • From: Michael Tuexen <Michael.Tuexen AT micmac.franken.de>
  • To: Patrick <stuedip AT student.ethz.ch>
  • Cc: <discussion AT sctp.de>
  • Subject: Re: [SCTP-Discussion] Multihoming
  • Date: Tue Oct 19 19:27:04 2004
  • List-id: SCTP Discussions <discussion.sctp.de>
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

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