Re: eth1 breaks eth0
- From: ibuprofin@xxxxxxxxxxxxxxxxxxxxxx (Moe Trin)
- Date: Sun, 04 Jan 2009 11:12:27 -0600
On Sun, 4 Jan 2009, in the Usenet newsgroup comp.security.firewalls, in article
<a059420b-795e-41d8-bf1c-8a7c43be5066@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>, spx2 wrote:
NOTE: Posting from groups.google.com (or some web-forums) dramatically
reduces the chance of your post being seen. Find a real news server.
I have a debian install on a machine with 2 eth cards,eth0 and eth1.
eth0 has been configured using pppoeconf for a pppoe connection which
is working fine.
eth1 was meant to be there in order to provide for a nat so that an
internet connection can be provided to another computer also using
debian.
You're posting from a search engine - and maybe you'd have better luck
by first using it to locate debian specific _newsgroups_ and if not
successful, trying the Usenet newsgroup 'comp.os.linux.networking'.
The moment I plug in the cable to eth1 , eth0 stops working.
OK - _before_ and after plugging in the cable, run the commands
/sbin/ifconfig -a
/sbin/route -n
(Is this caused maybe by hotplug ?)
Most likely.
I tried to find out the problem by trying to find out which file is
beeing modified when I plug the cable in eth1 so I did
strace ifconfig eth1 2>&1 | grep open
Very good!! Most people wouldn't think of that.
I got a list of files and I suspect /proc/net/if_inet6 is the file
that ifconfig modifies and reads thata from.
Are you actually _using_ IPv6? This would create a ifconfig output
that contains a line saying something like
eth0 Link encap:Ethernet HWaddr 00:60:97:32:4A:6A
inet addr:192.0.2.11 Bcast:192.0.2.255 Mask:255.255.255.0
inet6 addr: fe80::260:97ff:fe32:4a6a/64 Scope:Link
and the key is that third line. If the address begins with 'f' (here
'fe80:') IPv6 probably isn't doing you any good. You seem to be posting
from a Romanian IP range, and there are only six valid IPv6 ranges used
in that country:
2001:0b30::/32 2001:1518::/32 2001:4098::/32
2001:4b48::/32 2001:4d80::/32 2a01:07d8::/32
Only if the 'inet6 addr:' begins with one of these eight digits (the
/32 means the netmask is 32 bits with - eight digits) do you have a
working IPv6 address. In spite of the fact that IPv6 has been around
for 13 years, and that classic IPv4 addresses (such as 192.0.2.11) are
in very short supply, not many ISPs are supporting it.
So I decided to do sudo lsof | grep if_inet6 in order to find out
what process uses the hotplug feature to autodetect when I put the
cable inside eth1.
Can't help there - I don't use 'hotplug'.
What should I do so that the internet connection doesn't drop when I
plug in the cable for eth1 ?
Try posting to comp.os.linux.networking - mentioning the version of
Debian you are using (etch, lenny, sid), and show the output of
/sbin/ifconfig and /sbin/route before and after plugging in. Not
many people in _this_ Usenet newsgroup know about *nix.
Old guy
.
- References:
- eth1 breaks eth0
- From: spx2
- eth1 breaks eth0
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