Ping Problem

blackfish · 05-30-2006, 03:56 PM

Hi

I have setup FC4 on a Pentium 3 667MHz with 128MB RAM and a 6.4GB HDD

The setup is working fine,

I have connected my ADSL to the machine and it connects to the internet. I have also installed DHCPD which is assigning IP Addresses without fault.
I have a basic squid configuration which is also working.

I can access the Internet from any PC on the LAN and the Squid Server but i cannot Ping outside dns names such as www.google.com also i cannot send and recieve e-mail from OE

Any help gladly appreciated

BlackFish

acid_kewpie · 05-30-2006, 03:59 PM

sounds like you don't have dns on the clients then... do they have them listed in ipconfig /all on xp? are you firewalling their dns requests to the outside world? what IS your dns setup in general?

blackfish · 05-30-2006, 04:07 PM

i have my ISP DNS servers in my dhcpd.conf file and the clients are picking that up in the IPCONFIG /all

acid_kewpie · 05-31-2006, 01:01 AM

ok so what if you do a traceroute to the dns server ip address? it's pretty common to use a central server on your lan as the dns server for your clients locally.

withjigs · 05-31-2006, 06:56 AM

I think it will never workout... if you want that you should be able to ping outside servers from your lan...then instead of using SQUID proxy you will have to enable routing on your machine.
SQUID will forward web requests so your internet will work, but it won;t forwarde ICMP packets so ping won;t work...

linuxmanju · 05-31-2006, 07:50 AM

Try this in the server. Assuming eth1 is connected to local LAN and eth0 is connected to the internet.
Bash:> echo 1 /proc/sys/net/ipv4/ip_forward
Bash:> iptales -t nat -A POSTROUTING -i eth1 -o eth0 -j MASQUERADE

Chaooooooooooooooo...
Manjunath

blackfish · 05-31-2006, 12:25 PM

Quote:

Originally Posted by linuxmanju

Try this in the server. Assuming eth1 is connected to local LAN and eth0 is connected to the internet.
Bash:> echo 1 /proc/sys/net/ipv4/ip_forward
Bash:> iptales -t nat -A POSTROUTING -i eth1 -o eth0 -j MASQUERADE

Chaooooooooooooooo...
Manjunath

Hi I tried your advice the command generated this error

iptables v1.3.0: Can't use -i with POSTROUTING

acid_kewpie · 05-31-2006, 02:45 PM

i would just remove the -i option, it's not relevant there really.

why didn't i assume it wasn't set up to route data?? ugh...