RE: can't ping local 'net, even with no firewall
I'm assuming you have done an
echo 1 > /proc/sys/net/ipv4/ip_forward
to enable forwarding.
> -----Original Message-----
> From: Matthew Garman [mailto:garman@uiuc.edu]
> Sent: 22 July 2001 19:22
> To: Netfilter; Debian Firewall List
> Subject: can't ping local 'net, even with no firewall
>
>
>
> I have an internal LAN with two computers. Even with no
> firewall, I can't
> get the two computers to ping each other. For example, do
> the following
> to flush all iptables:
>
> iptables -F
> iptables -t filter -F INPUT
> iptables -t filter -F OUTPUT
> iptables -t filter -F FORWARD
> iptables -t nat -F
> iptables -t nat -F PREROUTING
> iptables -t nat -F POSTROUTING
> iptables -t nat -F OUTPUT
> iptables -t mangle -F
> iptables -t mangle -F PREROUTING
> iptables -t mangle -F OUTPUT
>
> Now I set all default policies to ACCEPT:
>
> iptables -P INPUT ACCEPT
> iptables -P OUTPUT ACCEPT
> iptables -P FORWARD ACCEPT
> iptables -t nat -P PREROUTING ACCEPT
> iptables -t nat -P POSTROUTING ACCEPT
> iptables -t nat -P OUTPUT ACCEPT
> iptables -t mangle -P OUTPUT ACCEPT
> iptables -t mangle -P PREROUTING ACCEPT
>
> And still the two computers can't ping each other. When I
> try to ping, I
> watch the lights on my switch: the lights for both computers
> are flashing,
> indicating link activity, but still ping times out.
>
> On my computer, which has the Internet connection, I can ping
> any host out
> on the internet.
>
> Any thoughts?
>
> Thanks,
> Matt
>
> --
> Matt Garman, garman@uiuc.edu
> "I'll tip my hat to the new constitution, Take a bow for the
> new revolution
> Smile and grin at the change all around, Pick up my guitar and play
> Just like yesterday, Then I'll get on my knees and pray..."
> -- Pete Townshend/The Who, "Won't Get Fooled Again"
>
>
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