[Dnsmasq-discuss] dnsmasq + nat(solved)

[andu novac]

On Mon, Jan 10, 2011 at 7:30 PM, andu novac <novac.andu at gmail.com> wrote:
> On Mon, Jan 10, 2011 at 7:21 PM, richardvoigt at gmail.com
> <richardvoigt at gmail.com> wrote:
>>
>> On Mon, Jan 10, 2011 at 10:07 AM, andu novac <novac.andu at gmail.com> wrote:
>>>
>>> I'm trying to share an internet connection (pppoe) from one computer
>>> to another via wifi (wlan0). I had this working fine before I upgraded
>>> fron 32 to 64 bit Debian. The problem is that the computer on the wifi
>>> network (the client) can reach some addresses (Google, Yahoo) but not
>>> others where it hangs forever (Facebook). This setup I'm using is a
>>> solution I found on the internet.
>>>
>>
>> If the client can reach some addresses, it's not a dhcp issue, and probably
>> not dns either, so dnsmasq is the last place I'd look.
>> My crystal ball says you have an MTU problem.  pppoe, like all tunnels,
>> often reduces the MTU for tunneled traffic.  If PTMU discovery isn't
>> configured or working right on the client, there could be problems.  Just
>> turning the interface MTU on the client down by 40 bytes or so may resolve
>> the issue.
>
> I'd be glad to try that if you were kind enough to explain me how. So
> this is the client computer you think?
> Is this what I must do: ifconfig wlan0 mtu 1492 (or whatever will be)?

Thanks, nice crystal ball, that did it!!

>
>>
>>
>>>
>>> The relevant options in dnsmasq.conf are:
>>> domain-needed
>>> bogus-priv
>>> interface=wlan0
>>> dhcp-range=10.11.5.1,10.11.5.5,12h
>>>
>>> and the script used to get everything working just configures wlan0
>>> for ad-hoc mode and
>>> /etc/init.d/dnsmasq restart
>>> iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE
>>>
>>> Any help would be appreciated, thanks.
>>>
>>> _______________________________________________
>>> Dnsmasq-discuss mailing list
>>> Dnsmasq-discuss at lists.thekelleys.org.uk
>>> http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
>>
>>
>