Networking dies after ppp?

I've got a redhat 6.1 box, and I've recently experienced loss of
networking after disconnecting from dial-up. I've been using kppp, and
haven't encountered this before (I had been using broadband and had to
return to dial-up).

I can ping localhost before dial-up and while online; once I disconnect, I
can't ping localhost anymore until I reboot. This makes it impossible to
connect to the web browser interface for cups and SWAT.

Here's netstat output while online; the output offline is the same except
for the ppp0 output. I don't know what the '255.etc' is, never used to
see that until I started using dial-up again, but it's present from
previous day's boot up and doesn't seem to affect this condition.

linus:/u2/home2/johnpipe$ netstat -rn
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt
Iface
209.148.112.7 0.0.0.0 255.255.255.255 UH 0 0 0
ppp0
192.168.1.3 0.0.0.0 255.255.255.255 UH 0 0 0
eth0
255.255.255.255 0.0.0.0 255.255.255.255 UH 0 0 0
eth0
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0
eth0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0
lo
0.0.0.0 209.148.112.7 0.0.0.0 UG 0 0 0
ppp0

Any suggestions for what I should be looking at to troubleshoot this?

Thanks,

Johnpipe

On Mon, 01 Mar 2004 20:25:48 GMT, John Meshkoff
<johnpipe@sonic.net> wrote:
>
> Any suggestions for what I should be looking at to troubleshoot this?
>
Redhat 9 or another distro from this century. :)


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John Meshkoff <johnpipe@sonic.net> wrote:
> I've got a redhat 6.1 box, and I've recently experienced loss of
> networking after disconnecting from dial-up. I've been using kppp, and
> haven't encountered this before (I had been using broadband and had to
> return to dial-up).

> I can ping localhost before dial-up and while online; once I disconnect, I
> can't ping localhost anymore until I reboot. This makes it impossible to
> connect to the web browser interface for cups and SWAT.

Can you ping 127.0.0.1?

If so then perhaps something related to bringing a PPP link up (in
the /etc/ppp/ip-up script?) changes the name assigned to 127.0.0.1
in /etc/hosts to the ISP's name for the PPP local IP address on each
connection. And rebooting changes it back to localhost. A WAG.

--
Clifford Kite Email: "echo xvgr_yvahk-ccc@ri1.arg|rot13"
PPP-Q&A links, downloads: http://ckite.no-ip.net/
/* Those who can't write, write manuals. */

Clifford Kite <kite@see.signature.id> wrote:

> Can you ping 127.0.0.1?

> If so then perhaps something related to bringing a PPP link up (in
> the /etc/ppp/ip-up script?) changes the name assigned to 127.0.0.1
> in /etc/hosts to the ISP's name for the PPP local IP address on each
> connection. And rebooting changes it back to localhost. A WAG.

Thanks, I found the problem (I couldn't ping 127.0.0.1 either). It seems
I had added a command to flush ipchains firewall rules to ip-down.local,
but didn't understand that I needed to reset the policies to ACCEPT. I
added the /sbin/ipchains -P {chain} ACCEPT to the script, and now
networking is OK.

Thanks for your reply,

John

Bill Marcum <bmarcum@iglou.com.urgent> wrote:
> On Mon, 01 Mar 2004 20:25:48 GMT, John Meshkoff
> <johnpipe@sonic.net> wrote:
>>
>> Any suggestions for what I should be looking at to troubleshoot this?
>>
> Redhat 9 or another distro from this century. :)

I'm using the same old P233mmx from several years ago, and don't have any
need to constantly upgrade (hey, linux isn't Microsoft! :^) ) for a box
that's just used for email and
occasional web browsing.

Thanks, John