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[SCTP-Discussion] sctplib1.3.1, add/delete ip


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  • From: Ilknur Aydin <aydin AT mail.eecis.udel.edu>
  • To: discussion AT sctp.de
  • Cc: Chien-chung Shen <cshen AT mail.eecis.udel.edu>
  • Subject: [SCTP-Discussion] sctplib1.3.1, add/delete ip
  • Date: Sun May 1 19:12:03 2005
  • List-id: SCTP Discussions <discussion.sctp.de>
Hello Andreas,

I am working with sctplib1.3.1 on the add/delete ip feature. Previously, I had read the source files on how add/delete ip feature is triggered. As far as I see, a routing socket is opened by sctplib and whenever there is change (add/delete) in the routing table, sending of an asconf add/delete ip chunk is triggered.

I had run echo_server and terminal programs and by using ifconfig, I was be able to observe paths added/deleted into the association. However, these were not consistent. For I while, I worked on some other things, and later needed to go back and check add/delete ip feature again, and now, I can not observe the feature at all :(.

The configuration, I use is like in Figure-1 (of the attached .pdf file).

I try the steps 1-5 below.
---------------------------------------
1- Initially, eth0 is not active, there is only loop back address in the routing table (see below).

[root@localhost programs]# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
127.0.0.0 * 255.0.0.0 U 0 0 0 lo
[root@localhost programs]# ifconfig
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:585875 errors:0 dropped:0 overruns:0 frame:0
TX packets:585875 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:45330936 (43.2 Mb) TX bytes:45330936 (43.2 Mb)


2- then, I ran echo_server and terminal on the loop back address as below, and communication is established between them.

./echo_server -V -s 127.0.0.1
1 : Communication up (10 In-Streams, 10 Out-Streams, 1 Paths)
1 : Network status change notification: path 1 status is ACTIVE STATE
(0)


./terminal -V -d 127.0.0.1 -s 127.0.0.1
1 : Communication up (1 paths, 10 In-Streams, 10 Out-Streams)
1 : Network status change notification: path 1 state is ACTIVE STATE
(0)


3- then I activated eth0 with the ifconfig command below.

[root@localhost programs]# ifconfig eth0 up


4- the result is that eth0 is activated with the private IP address (192.168.0.158).

[root@localhost programs]# ifconfig
eth0 Link encap:Ethernet HWaddr 00:0F:1F:10:8B:96
inet addr:192.168.0.158 Bcast:192.168.0.255 Mask:255.255.255.0
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:1873 errors:0 dropped:0 overruns:0 frame:0
TX packets:189 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:474075 (462.9 Kb) TX bytes:21144 (20.6 Kb)
Interrupt:11 Base address:0xe000 Memory:faffe000-fafff080

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:586221 errors:0 dropped:0 overruns:0 frame:0
TX packets:586221 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:45357419 (43.2 Mb) TX bytes:45357419 (43.2 Mb)
[root@localhost programs]# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.0.0 * 255.255.255.0 U 0 0 0 eth0
127.0.0.0 * 255.0.0.0 U 0 0 0 lo


5- However , though the routing table changes, I do not see "Network status change notification: " printed in neither echo_server nor "terminal" windows. That is, it is as if sctplib is not informed about the changes in the routing table.

Do you think that somehow the configuration in Figure-1 is not proper to observe add/delete ip feature ??

Now, I am trying to introduce a wireless interface to the laptop and try the set up like in Figure-2. Later, I will try to turn on and off the wireless interface and try to observe the add/delete ip. Do you think this set up would help observing add/delete ip feature ? Can you foresee any problems with this set up?

What kind configuration you had use while testing this feature ??

Thanks,
ilknur

Attachment: q.to.andreas.pdf
Description: Adobe PDF document


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