I'm assuming you have done an echo 1 > /proc/sys/net/ipv4/ip_forward
to enable forwarding. > -----Original Message----- > From: Matthew Garman [mailto:[EMAIL PROTECTED] > 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, [EMAIL PROTECTED] > "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" > >
