Dietmar Hofer wrote:
I haven't
found anythink clearing my problem doing some research in this list,
nevertheless I'm sorry if you find my question annoying 'cos I'm quite
new to this issue.
I'm in a class B LAN and would make a Machine work as Gateway for
another, both in the same network. This because the Internet Gateway
accepts only requests of registered Interfaces (MAC-based).
The Machine which I want to let do this has only one eth-Interface.
what in theory should be enough.
I set up NAT with "iptables -t nat -A POSTROUTING -o eth0 -j
MASQUERADE" and changed the route on the source machine to use the
other as gateway.
When pinging from the source machine, "/var/log/syslog" on the gateway
shows me this requests:
Dec 18 22:42:44 hogwart kernel: IN=eth0 OUT=eth0 SRC=""
DST=192.168.2.150 LEN=8
4 TOS=0x00 PREC=0x00 TTL=63 ID=0 DF PROTO=ICMP TYPE=8 CODE=0 ID=7294
SEQ=1
But I don't get an answer on the source machine, (while naturally i can
ping the given IP from the gateway itself).
In a HOWTO I found the hint that doing NAT with only 1 Interface for
input and output may not work with this config 'cos since kernel 2.4
some sort of ICMP redirections doesn't work or so...
What I want to know is just what I've to do to use this machine as
gateway with only one interface.
Hope you can help
I'm afraid I've never heard of a configuration where you use the same
NIC for both input and output. I doubt this would work for numerous
reasons, but even if it did, why bother? A NIC is $19.95 and a patch
cable is a few bucks. Wouldn't it be much easier to install another NIC
and avoid all the routing headaches?
Jeff
|
