[plug] strange modem behaviour under linux

[Kai]

Possibly your MTU is set too high?
What speed is it set-to on your Windows box?

----- Original Message ----- 
From: "Benjamin Keith" <bjkeith at cygnus.uwa.edu.au>
To: <plug at plug.linux.org.au>
Sent: Thursday, June 21, 2001 12:27 AM
Subject: [plug] strange modem behaviour under linux


> Hi list,
> 
> I'm having some trouble downloading to my home machine (Kuhal) under
> linux.  This machine is a dual boot Win95/Linux (Mandrake  7.0).  Under
> Linux it acts as a gateway for another Win95 box (Patch) using ip
> forwarding (ipchains).  The problem I am having is that when Kuhal is
> booted to Linux any form of downloading (netscape, ncftp, wget, ftp/http
> etc) stalls fatally, usually after only a few hundred kb.  When Kuhal is
> booted to Win95 I have no problem with any form of downloading.  When
> Patch is downloading *through* Kuhal I have no problems.  To me this
> would rule out any problem with the connection to my ISP or some fault
> in the modem (AcerModem 56 Surf).
> Below are some of the network and routing details:
> 
> [root at Kuhal bjkeith]# ifconfig -a
> eth0      Link encap:Ethernet  HWaddr 00:40:C7:2D:A6:67
>           inet addr:192.168.1.100  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:0 errors:6 dropped:0 overruns:0 carrier:12
>           collisions:102 txqueuelen:100
>           Interrupt:11 Base address:0xe400
> 
> lo        Link encap:Local Loopback
>           inet addr:127.0.0.1  Mask:255.0.0.0
>           UP LOOPBACK RUNNING  MTU:3924  Metric:1
>           RX packets:487 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:487 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0
> 
> ppp0      Link encap:Point-to-Point Protocol
>           inet addr:202.148.94.1  P-t-P:203.24.97.2
> Mask:255.255.255.255
>           UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
>           RX packets:8453 errors:120 dropped:0 overruns:0 frame:120
>           TX packets:7597 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:10
> 
> [root at Kuhal bjkeith]# route -n
> Kernel IP routing table
> Destination     Gateway         Genmask         Flags Metric Ref    Use
> Iface
> 255.255.255.255 0.0.0.0         255.255.255.255 UH    0      0        0
> eth0
> 203.24.97.2     0.0.0.0         255.255.255.255 UH    0      0        0
> ppp0
> 192.168.1.100   0.0.0.0         255.255.255.255 UH    0      0        0
> eth0
> 192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0
> eth0
> 127.0.0.0       0.0.0.0         255.0.0.0       U     0      0        0
> lo
> 0.0.0.0         203.24.97.2     0.0.0.0         UG    0      0        0
> ppp0
> 
> the ipchains line in /etc/rc.d/rc.local is:
> 
> # Setting up IP forwarding and Masquerading with ipchains
> /sbin/ipchains -A forward -j MASQ -s 192.168.1.0/24 -d 0.0.0.0/0
> 
> the ip for Kuhal is 192.168.1.100
> using dhcp Patch gets assigned 192.168.1.101
> 
> any insights or suggestions would be appreciated.  If any of the above
> is unclear or you want/need additional info let me know.
> 
> Thanks in advance
> 
> Ben
> 
> email: bjkeith at cygnus.uwa.edu.au
> 
> 
>