Date: Tue, 22 Feb 2000 19:01:24 -0000 (GMT) From: Joao Pedras <jpedras@webvolution.net> To: freebsd-net@freebsd.org Cc: freebsd-isdn@freebsd.org Subject: dropping connection Message-ID: <XFMail.000222190124.jpedras@webvolution.net>
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Hello all.
I have been using FreeBSD to use ordinary pc's as routers. Several of those
machines use the i4b daemon.
Althought this IS NOT a FreeBSD or i4b problem, I would like to submit it to
your consideration, so I could have an independent opinion about it.
Several of these routers connect through one of the major isp in our country.
Only in these installations I face the problem of disconnection when idle after
'x' time, to don't work (i.e. no matter how I configure the isdnd it never
drops the connection). The exact same configuration on other isp works properly
and performs the disconnect.
The problem is that this particular isp has their routers configured to send
some kind of keep alive, whenever the connection is idle.
I ran tcpdump on the isp0 interface and got the following :
19:45:36.787026 ID-063 LCP: Echo-Request, Magic-Number=-495599889
093f 000c e275 beef 0258 d272
19:45:36.787052 ID-063 LCP: Echo-Reply, Magic-Number=1285595741
0a3f 000c 4ca0 a25d 0258 d272
19:45:46.789844 ID-064 LCP: Echo-Request, Magic-Number=-495599889
0940 000c e275 beef 0258 d272
19:45:46.789865 ID-064 LCP: Echo-Reply, Magic-Number=1285595741
0a40 000c 4ca0 a25d 0258 d272
19:45:56.793551 ID-065 LCP: Echo-Request, Magic-Number=-495599889
0941 000c e275 beef 0258 d272
19:45:56.793570 ID-065 LCP: Echo-Reply, Magic-Number=1285595741
0a41 000c 4ca0 a25d 0258 d272
19:46:06.796127 ID-066 LCP: Echo-Request, Magic-Number=-495599889
0942 000c e275 beef 0258 d272
19:46:06.796147 ID-066 LCP: Echo-Reply, Magic-Number=1285595741
0a42 000c 4ca0 a25d 0258 d272
Frankly, I do not know of to interpret this data.
Do you find this situation normal ? I spoke with them and they didn't gave me
any 'real' reason to be doing this. They said they won't change their
configuration.
They suggested me to write some kind of filter to ignore this. Is this easily
achiavable ?
Just for curiosity, I read in the IOS 12.0 Configurartion book, that the keep
alive in Cisco routers could be enabled optionally.
I really don't see any use to this configuration. ]:(
Thanks for your help
Joao
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O O
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