Subject: ISDN - first TCP connection fails
To: None <email@example.com>
From: Ingolf Steinbach <firstname.lastname@example.org>
Date: 03/08/2002 18:36:52
on my NetBSD 1.5.3_ALPHA (i386) system with i4b 00.96.0
I have tried to set up the ISDN connection according to
(I was told that the i4b in -current is the same as 00.96.0,
so this description should work.)
The network configuration looks like this:
# ifconfig isp0
isp0: flags=a811<UP,POINTOPOINT,SIMPLEX,LINK1,MULTICAST> mtu 1500
inet 0.0.0.0 -> 0.0.0.1 netmask 0xff000000
inet6 fe80::200:c0ff:fe20:6b63%isp0 -> :: prefixlen 64 scopeid 0x8
# netstat -nr -f inet
Destination Gateway Flags Refs Use Mtu Interface
default 0.0.0.1 US 0 5062 1500 isp0
0.0.0.1 0.0.0.0 UH 0 0
127 127.0.0.1 UGRS 0 0 33228 lo0
127.0.0.1 127.0.0.1 UH 2 2 33228 lo0
192.168.2 link#1 UC 1 0 1500 we1
192.168.2.5 00:00:1c:d3:c3:13 UHLc 6 32887 1500 we1
This is the result of
ifconfig_isp0="inet 0.0.0.0 0.0.0.1 link1 down"
No ipnat rules are installed, and ipf is disabled. But both are
enabled in the kernel config file (in case it matters).
Let's now try to connect to an external host (www.netbsd.org):
% telnet -N 220.127.116.11
telnet: Unable to connect to remote host: Can't assign requested address
The first try to connect always fails: If I use tcpdump on isp0,
there is just some non-IP traffic (probably related to ppp).
The second try of the above telnet will usually succeed.
Am I missing something? Is this normal behaviour? How can I fix