Ubuntu Router misc questions

[Donatas]

Thank You very much. Now it seems everything is working. and Your command
iptables -L -t nat works.

P.S. it would be interesting to continue discussion about ufw configuration,
based on bsd pf, while i had sometime tried this and it works enogh cool on
openbsd

Thanks Again,
Donatas

On Tue, Jan 26, 2010 at 11:39 AM, Ian Coetzee <ubuntu at iancoetzee.za.net>wrote:

> On Tue, Jan 26, 2010 at 11:27 AM, Donatas <fetdonatas at gmail.com> wrote:
>
>> So i disabled ufw, added your iptables and save iptables configuration
>> then i check if iptables is working and get this one:
>>
>>
>> root at rout:~# iptables -L
>> Chain INPUT (policy ACCEPT)
>> target     prot opt source               destination
>>
>> Chain FORWARD (policy ACCEPT)
>> target     prot opt source               destination
>>
>> Chain OUTPUT (policy ACCEPT)
>> target     prot opt source               destination
>>
>>
> try using
>
> iptables -L -t nat
>
> the -t switch is used to tell it which table to use.
>
>
>>
>>
>>
>> On Tue, Jan 26, 2010 at 11:18 AM, Ian Coetzee <ubuntu at iancoetzee.za.net>wrote:
>>
>>> 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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-- 
Su pagarba,
Donatas
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