Internet server woes!!

stedo · 01-26-2004, 03:26 AM

hi,

I am running RH9.0 and I have set up a small LAN between a desktop (server) and a laptop (client). The desktop has two cards eth0 and eth1. I have access to the internet using eth0 which is set up via dhcp and I have access to my LAN through eth1 which I have set to a static address. The machines talk to each other fine and I have set up file sharing, no problem!!...until...... I try to get my laptop access to the internet. I have given my laptop the IP address of my desktop as a gateway but I'm not getting any access through the laptop browser. I have forwarding switched on but still no luck. Can anyone help???

Thanks
Steve

qwijibow · 01-26-2004, 05:40 AM

so you are saying you want to set up your desktop computer as a router.
have you installed the Redhat router packages ?

what configureations have you set ?

maybe u setip IP masquerading incorrectly ?

stedo · 01-26-2004, 06:13 AM

hi,

I haven't done anything with routing, where do I find the routing packages and what are they called?? I haven't set up any masquerading either how do I check this??

Thanks
Steve

qwijibow · 01-26-2004, 07:57 AM

i think there on either disk 2 or 3, cannot remember, use
redhat-config-packages as root.

basically, you need to configure iptables.

ive been speaking to some one else about this, aparently you dont ned the router packages, you can set it up manually.

become root, and post the output of the command
/sbin/iptables -L

iptables controlls all your network stuff like firewall rules and routing rules.
basically you need to add a rule that says if the network card recievs an ip packet thats addressed outside the local area network, ofrward that packet through to the modem.

its quite simple really, providing that your kernel has been configured and compiled to support IP MASQ, (which im 99% sure redhat is by default)

qwijibow · 01-26-2004, 08:02 AM

oops, forgot to post your link...

http://www.yolinux.com/TUTORIALS/Lin...rkGateway.html

stedo · 01-26-2004, 08:25 AM

hi,

Here's the result of the 'iptables -L':

Chain INPUT (policy ACCEPT)
target prot opt source destination

Chain FORWARD (policy ACCEPT)
target prot opt source destination

Chain OUTPUT (policy ACCEPT)
target prot opt source destination

thanks
Steve

qwijibow · 01-26-2004, 11:28 AM

so you havnt actually told your pc to act as a router yet then.
follow the instructions at the link i posted, mainly....

Quote:

# Delete and flush. Default table is "filter". Others like "nat" must be explicitly stated.
iptables --flush - Flush all the rules in filter and nat tables
iptables --table nat --flush
iptables --delete-chain - Delete all chains that are not in default filter and nat table
iptables --table nat --delete-chain

# Set up IP FORWARDing and Masquerading
iptables --table nat --append POSTROUTING --out-interface eth0 -j MASQUERADE
iptables --append FORWARD --in-interface eth1 -j ACCEPT

echo 1 > /proc/sys/net/ipv4/ip_forward - Enables packet forwarding by kernel

you may neet to switch eth0 and eth1 depending on which is conected to lan, and which is connected to modem.

so, got it all sorted yet ?

stedo · 01-26-2004, 01:07 PM

hi,

Think I have to read through a bit more about what those commands do but it worked!!! Thanks alot!

Cheers
Steve