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List:       linux-diald
Subject:    diald 1.0 and ip masq question
From:       "Owain McGuire" <owain () ofrm ! demon ! co ! uk>
Date:       2003-03-21 11:07:27
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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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