Hello, I bought a new USB ethernet adapter, but it seems not to work so well with debian. This is pretty much how I connect everything.

Verizon phoneline<--->DSL modem (192.168.1.1)<--
->Dlink wireless router (192.168.7.1)------wireless to laptop(xp) 7.100
\
\ethernet cable to debian (192.168.7.101)


Here is the strange stuff. On debian, I can exchange files with the XP laptop at rate of 700kb/s or so, both upload and download. I think it is ok since the NIC based on USB1.1.

However, I almost CANNOT access any website! All what I was able to do is just to see the frontpage of google.com or other webpage whose size no bigger than 1k bytes. I could not download any file from a remote ftp. But I could upload files to the remote public ftp server. Anyone knows how to sovle it? BTW: I checked the USB NIC, it works fine with the windows XP laptop.

iptables
localhost:/home/addin# iptables --list
Chain INPUT (policy ACCEPT)
target prot opt source destination

hain FORWARD (policy ACCEPT)
target prot opt source destination

Chain OUTPUT (policy ACCEPT)
target prot opt source destination

-----------------------------------------------------------
localhost:/home/addin# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.7.0 * 255.255.255.0 U 0 0 0 eth0
default 192.168.7.1 0.0.0.0 UG 0 0 0 eth0


================================================
localhost:/home/addin# traceroute 64.233.161.147
traceroute to 64.233.161.147 (64.233.161.147), 30 hops max, 40 byte packets
1 192.168.7.1 (192.168.7.1) 6.095 ms 1.902 ms 1.702 ms
2 dslrouter (192.168.1.1) 2.865 ms 2.741 ms 2.508 ms
3 * * *
===============================
traceroute results from xp
Tracing route to od-in-f147_google_com [64.233.161.147]
over a maximum of 30 hops:

1 1 ms 1 ms 1 ms 192.168.7.1
2 2 ms 2 ms 2 ms dslrouter [192.168.1.1]
3 31 ms 29 ms 30 ms 10.28.1.1
4 30 ms 29 ms 30 ms so-1-1-0-0.CORE-RTR2.LYN.verizon-gni.net

Using ifconfig, do you see any errors or dropped packets? What about in the syslog, any strange errors from the kernel?

Thank you. syslog is fine, I used ifconfig and here is the result. So it is obvioulsy something wrong at RX. Is
there a way to dig into eth0 driver and see why it drops packet?


After transfered a 45MB file to the laptop in LAN
eth0 Link encap:Ethernet HWaddr 00:60:6E:AA:0E:A9
inet addr:192.168.7.101 Bcast:192.168.7.255 Mask:255.255.255.0
inet6 addr: fe80::260:6eff:feaa:ea9/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:19948 errors:0 dropped:0 overruns:0 frame:0
TX packets:36465 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1239726 (1.1 MiB) TX bytes:47820580 (45.6 MiB)

After trying to connect to www.cnn.com
eth0 Link encap:Ethernet HWaddr 00:60:6E:AA:0E:A9
inet addr:192.168.7.101 Bcast:192.168.7.255 Mask:255.255.255.0
inet6 addr: fe80::260:6eff:feaa:ea9/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:20127 errors:16 dropped:8 overruns:0 frame:8
TX packets:36552 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1272239 (1.2 MiB) TX bytes:47830710 (45.6 MiB)

It is strange that you aren't getting anything in the system logs, even though it is acknowledging there is an error occurring through ifconfig.

There may be a way to load the module with an optional debug parameter. Can you determine which driver the adapter is actually using? It sounds like this might be a driver issue, in which case you will obviously need to figure out which one is being used before you can research it further.

The driver should be drivers/net/usb/dm9601.c. It is only recently added to the snapshot of kernel 2.6.21-rc7-git4. I failed to compile that kernel, so I pick out the dm9601.c and put it in the 2.6.20. I just don't know why it works fine if a destination is within the local network.

To best of my knowledge, the driver dm9601.c is oringally written for Davicom products and people
later extended it to support another brand ZT6688 which is my USB NIC chip.

here is a copy of dm9601.c http://grmso.net:8090/blob/5130cc7eb...69c9730882459/

I checked
localhost:/var/log# grep "eth0" *
localhost:/var/log# grep "9601" *
and no error report. Is there a way to activate the debug mode so that I could find out what's going on with my USB NIC. Thanks for your time,really appreciate it.

I have the same problem with. After I set the MTU to 1000, then I can download and brows from other computer. do you have got better solution?

I have a similar issue, where I have posted to ubuntuforums http://ubuntuforums.org/showthread.php?p=4273220

I have solved the issue, related to my post
http://ubuntuforums.org/showthread.php?t=688314