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Re: How do I completely reconfigure my network connection?


Ouch, this is scary.
I had installed postfix, courier-imap, mysql, sasl etc to setup a IMAP mail server.
At the end of the setup, I did a /etc/init.d/postfix restart and >>> wack <<<. Lost network connection.
OK, go and stop and start services, and it comes back again. Then do a /etc/init.d/postfix restart again, and what happens, I lost network connection for good.
I have every symptom that you have, although I did a 3.1 sarge clean install, and have security updated it all the time. The modules appear OK, ie rmmod e1000 followed by modprobe brings up the two NICs. 
the /etc/network/interfaces file was fine, then reduced it to bare minimum.
auto lo eth0
iface lo inet loopback
iface eth0 inet static
address 192.168.1.50
netmask 255.255.255.0
# only using one interface, and have added the other to test for NIC problems. 
iface eth1 inet static
address 192.168.1.51
netmask 255.255.255.0

Route file is fine with default gw 192.168.1.254 - dest 0.0.0.0 for eth0

From your post;

  /home/rls# ping 192.168.1.10
  PING 192.168.1.10 (192.168.1.10) 56(84) bytes of data
  From 192.168.1.102 icmp_seq=1 Destination Host Unreachable
  From 192.168.1.102 icmp_seq=1 Destination Host Unreachable
  From 192.168.1.102 icmp_seq=1 Destination Host Unreachable

is identical in behaviour to mine.....

traceroute 192.168.1.254
1 192.168.1.50 (192.168.1.50) 2919.509 ms H!  2999.198 ms H!  2999.351 ms H!

iptables --flush    (to be sure)
iptables -L          (is empty)

the basic test>>> ARP
the results are confusing??
Address HWtype HWaddress Flags Mask Iface 192.168.1.254 (incomplete) eth0 

Now, this looks incomplete. WHY?
WTF is going on. I'm an intermediate user, for several years, and then this... Everything points to a cut cable, poor connections or broken NIC, but it was the postfix restart that killed it in two instances. It looks fine to me, and looks like it should run, but it doesn't.
How did Randell solve his reset problem? Are there any suggestions to be able to reset the network interfaces, without having to destroy the current install?
My concern is that if I restore from backup, I'm back at square one with this problem. I would like to find the cause, but I need the network up and running to find the issue. 

Any help appreciated.
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