Re: tap0 or ppp0?

Hi Owain,

I'm not sure what your firewall script looks like, but I think it will 
have to have masquerade rules for both the ppp0 and tap0 interfaces.

It sounds like there are no forward/masq rules for tap0, so diald 
doesn't get any packets from the masqueraded machines if the link is down.

You might try to edit the script and duplicate the masq rules 
substituting tap0 for ppp0.

Hope that helps!

Mark.


Owain McGuire wrote:
> Simple question really??
> 
> I have upgraded from diald 0.9 to 1.0 and sorted out all of the
> ethertap stuff.  The only thing is that the masqueraded machines don't
> seem to be able to bring up the ppp connections themselves.  The
> "server" machine can though.  I have followed the IP_Masq_Howto for
> 2.4 kernels but I have a question for the rc.firewall-2.4 script.
> Should the external interface be tap0 or ppp0?  I am confused as to
> how the flow or handoever of traffic from tap0 to ppp0 works.
> 
> I currently have it set to ppp0 which seems fine when the link is up
> since ifconfig gives me:
> 
> ppp0      Link encap:Point-to-Point Protocol  
>           inet addr:158.152.189.169  P-t-P:158.152.1.222
> Mask:255.255.255.255
>           UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
>           RX packets:3520 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:3294 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:3 
>           RX bytes:1531219 (1.4 Mb)  TX bytes:250596 (244.7 Kb)
> 
> tap0      Link encap:Ethernet  HWaddr FE:FD:00:00:00:00  
>           UP BROADCAST RUNNING NOARP MULTICAST  MTU:1500  Metric:1
>           RX packets:2 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:2 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0 
>           RX bytes:142 (142.0 b)  TX bytes:142 (142.0 b)
>           Interrupt:5 
> 
> But when the link is down it is:
> 
> tap0      Link encap:Ethernet  HWaddr FE:FD:00:00:00:00  
>           inet addr:158.152.189.169  Bcast:0.0.0.0
> Mask:255.255.255.255
>           UP BROADCAST RUNNING NOARP MULTICAST  MTU:1500  Metric:1
>           RX packets:2 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:2 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0 
>           RX bytes:142 (142.0 b)  TX bytes:142 (142.0 b)
>           Interrupt:5 
> 
> which suggests that ppp0 as an external interface is wrong.
> 
> Or is it that my default route isn't set up correctly?  Should it not
> point to tap0?
> 
> Destination     Gateway         Genmask         Flags Metric Ref
> Use Iface
> demon-du.demon. *               255.255.255.255 UH    0      0
> 0 ppp0
> 10.0.0.0        *               255.255.255.0   U     0      0
> 0 eth0
> loopnet         *               255.0.0.0       U     0      0
> 0 lo
> default         *               0.0.0.0         U     0      0
> 0 ppp0
> 
> 
> Thanks in advance.
> 
> O.
>  
> 
> 
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