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I'm having problems with packets from internet.

I have a little network. theare are a firewall which masquerade all paquets.
Now I have a server for web, email etc...

Both of them, firewall and server, are debian-linux machines.

The firewall have a adsl line. theare are about 10  windows machines which
use internet conection by the firewall.

All these machines ( the windows ones) use full internet without problems.
But the server have a big problem whit packets...

For instance, if I write ping www.gulic.org from the server, I get the

 ping www.gulic.org
PING www.gulic.org ( 56 data bytes
64 bytes from icmp_seq=0 ttl=237 time=157.7 ms
64 bytes from icmp_seq=1 ttl=237 time=465.3 ms

and I only can receive one or two response to the ping, after Ctrl+C I get
the follow:

--- www.gulic.org ping statistics ---
9 packets transmitted, 2 packets received, 77% packet loss
round-trip min/avg/max = 157.7/311.5/465.3 ms

The problem is only if I ping to a exterior IP. If I ping to an internal
one, the response of ping is normal:

PING ( 56 data bytes
64 bytes from icmp_seq=0 ttl=128 time=0.7 ms
64 bytes from icmp_seq=1 ttl=128 time=0.6 ms
64 bytes from icmp_seq=2 ttl=128 time=0.7 ms
64 bytes from icmp_seq=3 ttl=128 time=0.7 ms
64 bytes from icmp_seq=4 ttl=128 time=0.7 ms
64 bytes from icmp_seq=5 ttl=128 time=0.7 ms
64 bytes from icmp_seq=6 ttl=128 time=0.7 ms

--- ping statistics ---
7 packets transmitted, 7 packets received, 0% packet loss
round-trip min/avg/max = 0.6/0.6/0.7 ms

The server have a pci ethernet with the 8029 realtek chip.

The server have a  2.4.18 kernel with xfs journaling support.

The irq of the ethernet is 10 and is shared with the usb port.

Could anyone help me with this problem?

Sorry for my bad English and thanks in advance.

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