Hello
Approximatly 1 week ago, I posted a message regarding an possible IP_forwarding
bug/problem and we've had limited success in resolving it.
In summary, we had (note had) a RH 5.0 box as a gateway/firewall for a private
subnet (192.168.1.x) and a public subnet off two ethernet cards, and then a ppp
link to the 'Net.
We had problems with 5.0 forwarding packets on so we reverted back to 4.1 with
kernel 2.0.27 (out of the box with IP-forwarding compiled in).
That was working like a gem until a few days ago, when for no apparent reason,
the forwarding stopped.
As an example, if we ping'd from our facilities to a machine off eth0 (public
subnet) it would find its
way through to the gateway machine/ppp interface, but stall there.
Now, this is what proc says:
[root@gateway net]# cat /proc/net/ip_forward
IP firewall forward rules, default 0
..
..
..
..
..
The ..'s are forwarding rules for the firewall.
That default 0 to me says that ip_fowarding is turned off.
[root@gateway net]# cat /proc/ksyms |grep ip_forward
00147c40 ip_forward_Rb2273aca
That line says that ip-forwarding is in the kernel.
We've tried things like echo "1" >/proc/net/ip_forward but that"default 0" wont
change.
My understanding is that that default line should read 1 or 4 ?
No configuration was changed or or around last friday when this thing bit the
dust and with a large client suffering the demise of no net connectivity, (mail
server is off on the public network which isnt reachable!), we are desparate to
get this repaired.
Does anyone have any ideas WHAT could be the problem?
The firewalling only touches eth1 which is the private network so thats not
able to conflict.
Id be happy to give more information to anyone who asks.
If anyone has _any_ suggestions, I'd be greatly appreciative.
Thanks in advance.
Regards
Adam
--------------------------------------------------
IPAX Systems
Melbourne, Australia
National Systems Manager
Ops Tel: 03 - 9887-1984
Ops Fax: 03 - 9801-8533
Web Site http://www.ipax.com.au
--------------------------------------------------
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