Ubuntu Router misc questions

[Donatas]

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



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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>>>>>>
>>>>>
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>>>>
>>>>
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>>
>>
>> --
>> Su pagarba,
>> Donatas
>>
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>>
>
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