Configuring GW to DSL Internet

[Didar Hossain]

On Wed, Jan 6, 2010 at 2:15 PM, Didar Hossain <didar.hossain at gmail.com> wrote:
> On Wed, Jan 6, 2010 at 1:15 PM, j.halifax . <j.halifax at seznam.cz> wrote:
>> Hi All,
>>
>> Pleaase help me in configuring FC12_64 as DHCP & FW & GW to ADSL Internet.
>>
>> I have:
>> - eth0 (xxx.39.189.92) connected to one port of the DSL router, eth0 configured with DSN' of ISP
>> - eth2 (10.255.250.37) connected to the local LAN, eth2 configured with DNS' of ISP
>> - DNS' of ISP are defined also in resolv.conf
>> - named is running
>> - dnsmasq running for eth0 (connected to DSL router port)
>> - iptables running
>> - FW has dns ports (53) open
>> - FW has eth2 (to internal LAN) as trusted interface
>> - Internet is accessible in that box (via eth0), websites in internal LAN as well (via eth2).
>>
>> >From another box in the LAN:
>>> ping 10.255.250.37
>>    responds normal way
>>> host isp.com 10.255.250.37
>>   doesn't respond
>>   (in the 10.255.250.37 box the tcpdump shows requests coming in port 53, but they are not forwarded to superior ISP DNS and SUGHUP1 to dnsmasq reports 0 requests received/answered/failed/retried/sent)
>>
>> My question is: What is it incorect in my configuratins?
>
> Maybe you need to -
> echo 1 > /proc/sys/net/ipv4/ip_forward
>
> and
>
> iptable -t nat -A POSTROUTING -s 10.255.250.0/24 -j SNAT --to xxx.39.189.92

Assuming, you set up 10.255.250.0 as class C - not right, but, people
do it sometimes.

Didar