[Gllug] ppp networking problems

Sun Apr 20 10:06:14 UTC 2003

Hi all,
I am having problems surfing the internet on my 192.168.1.3 (laptop) 
machine which is connected to this machine 192.168.1.2 via eth0, and 
directly to the internet via a 56k serial modem ppp0. When I try to 
connect using a chat-connect script
  #!/bin/sh
chat ABORT BUSY ABORT "NO CARRIER" TIMEOUT 120 "" AT OK ADTD08456651575 
CONNECT

  I get a connection, but then I am not able to
actually browse any websites. According to the messages from syslogd the
eth0 connection is "not replacing existing default route to eth0". How
can I alter things to correct this?
I had exactly the same problems using Mandrake 9.0 in December, but I 
have just completed a hard disk install of Knoppix 3.2 and so I'm now 
running Debian.
Regards,
Mark Preston

I connect using the command:
pppd /dev/modem 38400 modem lock connect /etc/ppp/chat-connect user 
preston defaultroute usepeerdns

syslogd logging info
Output from #tail -f /log/messages/ppp_article
Apr 20 08:58:13 m kernel: PPP generic driver version 2.4.2
Apr 20 08:58:13 m pppd[616]: pppd 2.4.1 started by root, uid 0
Apr 20 08:58:44 m pppd[616]: Serial connection established.
Apr 20 08:58:44 m pppd[616]: Using interface ppp0
Apr 20 08:58:44 m pppd[616]: Connect: ppp0 <--> /dev/modem
Apr 20 08:58:45 m pppd[616]: Warning - secret file /etc/ppp/pap-secrets 
has world and/or group access
Apr 20 08:58:45 m pppd[616]: Warning - secret file /etc/ppp/pap-secrets 
has world and/or group access
Apr 20 08:58:46 m kernel: PPP BSD Compression module registered
Apr 20 08:58:46 m kernel: PPP Deflate Compression module registered
Apr 20 08:58:47 m pppd[616]: not replacing existing default route to 
eth0 [192.168.1.254]
Apr 20 08:58:47 m pppd[616]: Cannot determine ethernet address for proxy ARP
Apr 20 08:58:47 m pppd[616]: local  IP address 80.225.204.34
Apr 20 08:58:47 m pppd[616]: remote IP address 80.225.252.34
Apr 20 08:58:47 m pppd[616]: primary   DNS address 80.225.253.50
Apr 20 08:58:47 m pppd[616]: secondary DNS address 80.225.254.178

  Output from #ifconfig once ppp connection is achieved
eth0      Link encap:Ethernet  HWaddr 00:90:F5:0A:99:43
           inet addr:192.168.1.3  Bcast:192.168.1.255  Mask:255.255.255.0
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
           TX packets:2 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:100
           RX bytes:0 (0.0 b)  TX bytes:84 (84.0 b)
           Interrupt:10 Base address:0x3200

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:71 errors:0 dropped:0 overruns:0 frame:0
           TX packets:71 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:0
           RX bytes:4630 (4.5 KiB)  TX bytes:4630 (4.5 KiB)

ppp0      Link encap:Point-to-Point Protocol
           inet addr:80.225.204.34  P-t-P:80.225.252.34 
Mask:255.255.255.255
           UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
           RX packets:12 errors:0 dropped:0 overruns:0 frame:0
           TX packets:12 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:3
           RX bytes:135 (135.0 b)  TX bytes:166 (166.0 b)
  Output from #netstat -r
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt 
Iface
192.168.1.0     *               255.255.255.0   U        40 0          0 
eth0
default         192.168.1.254   0.0.0.0         UG       40 0          0 
eth0

<file /etc/network/ifstate contents>
lo=lo
eth0=eth0

<file /etc/network/ifstate contents>
ip_forward=no
spoofprotect=yes
syncookies=no

<file /etc/network/interfaces contents>
# /etc/network/interfaces -- configuration file for ifup(8), ifdown(8)

# The loopback interface
# automatically added when upgrading
auto lo eth0
iface lo inet loopback

iface eth0 inet static
	address 192.168.1.3
	netmask 255.255.255.0
	network 192.168.1.0
	broadcast 192.168.1.255
	gateway 192.168.1.254

Any hints on what configuration files need adjusting or other actions 
that need to rectify this would be much appreciated. Bruce Richardson 
helped me solve this problem last time when he suggested "I'd guess that 
you have configured that box to treat the 192.168.1.2 box
as a gateway and a default route has been set.  pppd connects, tries to
set the default route to go through the newly created connection and
fails because it can't replace the existing route", but changing gateway 
192.168.1.254 to devgateway ppp0 doesn't work, unlike the previous 
situation with Mandrake 9.0.
TIA
Regards,
Mark Preston

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