My server has 127.0.0.1 ip instead of one from a remote DHCP server?
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It's how you setup the firewall, if you can ping other machines, then you have a valid IP, the 127.0.0.1 is a loopback address.
Try ifconfig from the command line, and it should show 2 (or more) intrefaces lo & eth0, eth0 is what you should look at.
I have't configured a router, and don't know where to start.
It looks like a firewall issue, the machine can ping others but other can't ping it.
It could be simply a setting that rifuses a ping request, there 2 ways to resolve the this,
1) throu the firewall program.
2) using ip chains (it's the same as 1, but using text comands instead of a gui)
If you installed an aditional firewall on you system, just do the following.
in a terminal type
ps -ax |more *and find the firewall program that is runing and it's PID*
Kill -9 PID *the PID the number you got using the first command*
If you are using the standard firewall that came w/ RH
In the (start) menu, under services, or network, you should find the firewall program/configurator, from there you can disable, lower or increase the firewall protection and enable what it accepts or not (i.e. HTTP, FTP, ...etc)