Ubuntu Router misc questions

[Ian Coetzee]

On Tue, Jan 26, 2010 at 11:05 AM, Donatas <fetdonatas at gmail.com> wrote:

> Yes, i can even ping the router's external interface from the dhcp client
>
>
ok then its definately a firewall issue.

you need a masquerade rule on the router.

using iptables it should be

iptables -t nat -A POSTROUTING -j MASQUERADE

it will masquerade all packets, if you only want to masquerade outgoing
packets

iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

I dont know about ufw.

Regards
Ian


>
> On Tue, Jan 26, 2010 at 10:55 AM, Ian Coetzee <ubuntu at iancoetzee.za.net>wrote:
>
>> On Tue, Jan 26, 2010 at 10:31 AM, Donatas <fetdonatas at gmail.com> wrote:
>>
>>> This one is enabled.
>>> Even if i turn off firewall - there is no internet on internal pc
>>>
>>>
>> can you get to the internet from the server/router?
>>
>>
>>> Donatas
>>>
>>>
>>> On Tue, Jan 26, 2010 at 10:23 AM, Ian Coetzee <ubuntu at iancoetzee.za.net>wrote:
>>>
>>>> On Tue, Jan 26, 2010 at 8:39 AM, Donatas <fetdonatas at gmail.com> wrote:
>>>>
>>>>> Hello,
>>>>> i'm trying to understand how ubuntu server 8.04 firewall is made, while
>>>>> i always got configured earlier versions for internet routing, and now i'm
>>>>> confused.
>>>>> I set up my both network interfaces (eth0 with dhcp and eth1 with
>>>>> static IP for internal network). I also configure dhcp3-server and it works.
>>>>> While i connect some PC to this router, i have no internet access. I've
>>>>> tried the UFW which is new for me and it's confusing while using both
>>>>> iptables and bsd type configuration. Tried traditional ip tables, but still
>>>>> it doensn't work. If someone could show me the right way - i mean the
>>>>> easiest firewall configuration.
>>>>>
>>>>> Thank You!
>>>>>
>>>>
>>>> Have you tried
>>>>
>>>> echo "1" > /proc/sys/net/ipv4/ip_forward
>>>>
>>>> Regards
>>>> Ian
>>>>
>>>>
>>>>>
>>>>> --
>>>>> Regards,
>>>>> Donatas
>>>>>
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>
>
> --
> Su pagarba,
> Donatas
>
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