[tulip] LinkSys Etherfast 100 problems

[Brian C]

Hi,

I'm not sure if I'm chasing the right problem or not, so here's the complete scoop.

I have a linux box (kernel 2.2.16) that I want to set up as a firewall and masquerader.  I 
have a 3Com 3c509 connected to the local network.  I have a Linksys etherfast 100 (new 
within the last two months) that needs to connect to my new Sprint broadband modem.  
This is for the Sprint wireless broadband, so it's not a cable modem or DSL modem.  

When it was installed two days ago, we hooked it up to a Windows machine with a 3com 
3c905? 10/100 card.  Using DHCP, it connected quickly to the broadband modem and got 
it's assigned IP.  Everything is working wonderfully in this configuration.

When I move the cable over to the Linux box, all is not so well.  The local net's 3c509 is 
set up as eth0 and the linksys is eth1.  Yes, the driver loads fine and 'dhcpcd eth1' 
configures eth1 perfectly.  So it talks to the broadband modem right??

Anyway, once this is done, dhcpcd also sets the default route to eth1.  My static IP is 
xx.x.xx.253 and the broadband modem has an IP of xx.x.xx.252.  From the linux box, I 
can ping xx.x.xx.253, but not xx.x.xx.252!  Everything should be working.  

Here is the output from netstat -rn:
Kernel IP routing table                                                         
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface  
192.168.0.0     0.0.0.0         255.255.255.0     U          0 0          0 eth0   
xx.x.xx.0        0.0.0.0         255.255.255.0     U          0 0          0 eth1   
127.0.0.0         0.0.0.0             255.0.0.0        U          0 0          0 lo     
0.0.0.0           xx.x.xx.252         0.0.0.0         UG        0 0          0 eth1   

and here is the output from ifconfig:
eth0      Link encap:Ethernet  HWaddr 00:60:8C:F4:18:3F                     
          inet addr:192.168.0.1  Bcast:192.168.0.255  Mask:255.255.255.0    
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1                
          RX packets:26 errors:0 dropped:0 overruns:0 frame:0               
          TX packets:9 errors:0 dropped:0 overruns:0 carrier:0              
          collisions:0 txqueuelen:100                                       
          Interrupt:10 Base address:0x300                                   
                                                                            
eth1      Link encap:Ethernet  HWaddr 00:20:78:1E:FE:78                     
          inet addr:66.1.98.253  Bcast:66.1.98.255  Mask:255.255.255.0      
          UP BROADCAST NOTRAILERS RUNNING  MTU:1500  Metric:1               
          RX packets:11 errors:0 dropped:0 overruns:0 frame:0               
          TX packets:229 errors:0 dropped:0 overruns:0 carrier:0            
          collisions:0 txqueuelen:100                                       
          Interrupt:9 Base address:0x4c00                                  
                                                                            
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:67 errors:0 dropped:0 overruns:0 frame:0               
          TX packets:67 errors:0 dropped:0 overruns:0 carrier:0             
          collisions:0 txqueuelen:0                                         
                                                                            
and here is the output of cat /proc/pci:
PCI devices found:
  Bus  0, device  12, function  0:
    VGA compatible controller: Weitek P9100 (rev 0).
      Medium devsel.  
      Non-prefetchable 32 bit memory at 0xfe000000 [0xfe000000].
  Bus  0, device  14, function  0:
    Ethernet controller: Unknown vendor Unknown device (rev 17).
      Vendor id=1317. Device id=985.
      Medium devsel.  Fast back-to-back capable.  IRQ 9.  Master Capable.  Latency=64.  
Min Gnt=255.Max Lat=255.
      I/O at 0xfc00 [0xfc01].
      Non-prefetchable 32 bit memory at 0xffbe7c00 [0xffbe7c00].
  Bus  0, device  16, function  0:
    Host bridge: UMC UM8881F (rev 4).
      Medium devsel.  Master Capable.  No bursts.  
  Bus  0, device  18, function  0:
    ISA bridge: UMC UM8886A (rev 14).
      Medium devsel.  Master Capable.  No bursts.  
  Bus  0, device  18, function  1:
    IDE interface: UMC UM8886BF (rev 16).
      Fast devsel.  Master Capable.  No bursts.  
      I/O at 0x170 [0x171].
      I/O at 0x374 [0x375].
      I/O at 0xffe0 [0xffe1].
      I/O at 0xfff0 [0xfff1].
      I/O at 0xffa0 [0xffa1].


What concerns me is the discrepancy between the ifconfig and the pci outputs.

Notice that according to the /proc/pci, my pci ethernet card is at I/O 0xfc00 and ifconfig 
reports the I/O at 0x4c00?  Anyway, tulip-diag reports the same as /proc/pci.  Maybe that 
just because it reads that file?  

When I try to ping xx.x.xx.252, the TX packets go up considerably and the RX packets 
barely move.  

Remember I said that the broadband modem and cable work fine when connected to a Win 
machine...

I'm looking for ideas.. do the address differences mean anything?  Do I need to look 
elsewhwere for the answer to this problem?

Thanks for any and all info.
Brian