iptables/multiple external natting problem
marc at gocontent.com
Tue Oct 25 19:40:39 CEST 2005
I'm trying to setup a firewall at our data center and I think I'm
missing a few things here. I have a Class C ip range, lets call it
22.214.171.124/24. I have a firewall running kernel 2.6.9 and iptables 1.2.11.
My firewall has 2 network interfaces, on the external interface I've
added an alias for each external ip that I want to nat to internal servers:
eg. ifconfig eth0:0 126.96.36.199 netmask 255.255.255.0
(Is this the correct way to use multiple ip's?)
My servers on the inside interface are on the 192.168.0.0/24 network.
I'm able to ssh to an internal server via an external ip address.
The problem is I can't seem to connect out (via ssh, dns, www etc) from
the inside servers. There is a rule blocking these connections as it
shows me in the firewall logs:
Oct 25 18:27:22 fw1 kernel: IN=eth1 OUT=eth0 SRC=192.168.0.20
DST=188.8.131.52 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=28642 DF PROTO=UDP
SPT=32769 DPT=53 LEN=40
Oct 25 18:27:31 fw1 kernel: IN=eth1 OUT=eth0 SRC=192.168.0.20
DST=184.108.40.206 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=18271 DF PROTO=TCP
SPT=32792 DPT=22 WINDOW=5840 RES=0x00 SYN URGP=0
I've attached my firewall script, could someone please take a look at it
and give me a hand. Or if they have a similar setup, could you send me
your config. If there is a better way to do this, please let me know.
-------------- next part --------------
A non-text attachment was scrubbed...
Size: 3450 bytes
Desc: not available
Url : /pipermail/netfilter/attachments/20051025/762364ea/firewall.bin
More information about the netfilter