| laurens |
08-04-2009 06:01 PM |
General Question IPTABLES with DHCP
On my gateway 192.168.0.1 I have the following configuration for my network interfaces
Code:
debian1:/home# ifconfig
eth0 Link encap:Ethernet HWaddr 00:0c:29:3a:64:49
inet addr:192.168.126.128 Bcast:192.168.126.255 Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fe3a:6449/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:48240 errors:0 dropped:0 overruns:0 frame:0
TX packets:21633 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:60015843 (57.2 MiB) TX bytes:1623577 (1.5 MiB)
Interrupt:19 Base address:0x2000
eth1 Link encap:Ethernet HWaddr 00:0c:29:3a:64:53
inet addr:192.168.0.1 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fe3a:6453/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:24433 errors:0 dropped:0 overruns:0 frame:0
TX packets:44292 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2138382 (2.0 MiB) TX bytes:53612898 (51.1 MiB)
Interrupt:19 Base address:0x2080
eth2 Link encap:Ethernet HWaddr 00:0c:29:3a:64:5d
inet addr:192.168.1.1 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fe3a:645d/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:5017 errors:0 dropped:0 overruns:0 frame:0
TX packets:62 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:582408 (568.7 KiB) TX bytes:3036 (2.9 KiB)
Interrupt:16 Base address:0x2400
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:67 errors:0 dropped:0 overruns:0 frame:0
TX packets:67 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:19932 (19.4 KiB) TX bytes:19932 (19.4 KiB)
Now, I never really understood if IPTABLES works as good with DHCP on one of the adapters.
E.g. First, situation1 where eth1 (connected to internet) has a static IP address, 172.23.81.248
Code:
# Natting
iptables -t nat -A POSTROUTING -o eth0 -j SNAT --to 172.23.81.248
Situation2: when you don't have a static IP but a DHCP IP, can you replace the IP address -simply- with the interface (here eth1) ?!
Code:
# Natting
iptables -t nat -A POSTROUTING -o eth0 -j SNAT --to eth1
If so, is this the best method?
Thanks a advance for clarifying ! |
