Ping only one way

[ikemup]

i just realized that a networking forum exists, so please excuse an earlier post.

i am not able to ping from a windows machine to a linux machine. however, the linux machine has no problems pinging the windows machine. both network cards are installed and working properly. and the ip addresses are windows-192.168.0.4, linux-192.168.0.3. subnet mask is 255.255.255.0 for both.

this could determine whether i keep linux on this machine or not. i would love to keep it, but it's of little use without ability to access other machines. it has a superdisk instead of a standard floppy, and i can't get that to work, either. so the cdrom and internet are the only two ways that i'll be able to get new packages to use.

any ideas? thanks in advance!

[jumpedintothefire]

You may of loaded a firewall that is set to disregard the ICMP requests.

try as root from the command prompt:

ipchains -L -v -n
or
iptables -L -v -n

if you get a bunch of scrolling lines that look weird, you have a firewall loaded...

If one is not loaded you should see something like this:

Chain input (policy ACCEPT )
Chain forward (policy ACCEPT )
Chain output (policy ACCEPT )

Good Luck :)

[ 04 November 2001: Message edited by: jumpedintothefire ]

[ikemup]

thanks, but no goat. i tried your suggestion, and learned that i am not running a firewall. anything else?

[ikemup]

ok, *slaps forehead*. so i forgot that windows requires rebooting every 4 minutes. i'm typing this from linux now, even running through the proxy server on the windows machine. however, i am still unable to ping the other box on the network. there is only one other machine at the moment, but i am planning to add one more. the other two machines are working in a workgroup, cleverly named 'HOME'. i don't think that this could be causing the problem, but maybe it is. any ideas? thanks, again!

[jumpedintothefire]

try:

cat /proc/sys/net/ipv4/icmp_echo_ignore_all

if it comes back 1, this is turned on, and the box will not respond to icmp.

so then do a

echo 0 > /proc/sys/net/ipv4/icmp_echo_ignore_all

to turn it off.

ps I'm running out of ideas......

[ikemup]

wow. the shell is telling me that i don't have permission to execute that statement, even as root. maybe if i kick the damn box hard enough, i'll influence it a little to obey me more. thanks, again!

[jumpedintothefire]

check the permissions / ownership with ls -l it should look like:

-rwxr-xr-x 1 root root 10492 Aug 10 1999 cat


in /bin for me anyway....

[ 05 November 2001: Message edited by: jumpedintothefire ]

[ikemup]

thanks! not sure why it wouldn't let me do it before, but it's working now. it returns 0 for the value, so i guess that it will accept icmp (whatever it is). at least i have internet access. can't use ftp, but http is working. thanks, again!