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problem with ppp0



I have kernel 2.4.18 installed on powerbook g3 and am having some 
difficulty with remote access.

I use my laptop both at home (ppp) and work (ethernet), and I have the 
/etc/network/interfaces file configured as:

auto lo
iface lo inet loopback
iface eth0 inet dhcp
iface ppp0 inet dhcp

At work, I plug in ethernet and do 'ifup eth0', and I am fine.

At home, I use kppp to dialup.  I am able to make a connection (according 
to kpp log and /var/log/messages) but I get an error message displayed on 
my root console:

Couldn't find interface ppp0: No such device

I get this message regardless of whether or not I have done 'ifup ppp0' 
before making the connection.  And I can't do anything on the internet.  
Command 'route' gives me nothing...

Command 'ifconfig' tells me that I have ppp0 up though:

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:58 errors:0 dropped:0 overruns:0 frame:0
          TX packets:58 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:4020 (3.9 KiB)  TX bytes:4020 (3.9 KiB)

ppp0      Link encap:Point-to-Point Protocol
          inet addr:128.112.71.154  P-t-P:128.112.64.131  
Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:5 errors:1 dropped:0 overruns:0 frame:0
          TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:3
          RX bytes:125 (125.0 b)  TX bytes:87 (87.0 b)

tap0      Link encap:Ethernet  HWaddr FE:FD:00:00:00:00
          inet addr:192.168.0.1  Bcast:0.0.0.0  Mask:255.255.255.255
          UP BROADCAST RUNNING NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 b)  TX bytes:258 (258.0 b)
          Interrupt:5

I'm new at this and am quite in the dark (what's tap0 anyway?).  I would 
appreciate any advise.  

Thanks in advance, 
-Katsumi






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