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Old 02-05-2008, 12:42 PM   #1
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Registered: Nov 2003
Posts: 4

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Davicom usb ethernet adapter works partially

Hi folks, I am having some issues related to the use of a usb ethernet adapter, its a davicom.
The linux is gutsy (kubuntu) with the latest updates applied. Kernel version 2.6.22-14-generic

See below the specifications and settings.

What I found weird, some websites connect to, but others sites doesn't connect (HTTP os SSH), the firefox, displays at status bar "waiting data" forever. Websites such as works fine, but many others I try doesn't work (facebook,,,
Currently I have eth0 (usb ethernet) and eth1 (wireless). eth1 works fine.

I saw at ifconfig, there are a lot of dropped and errors at RX transmissions. (see far below, detailed information)

RX packets:3501 errors:542 dropped:170 overruns:138 frame:659

I did some bit of debug with wireshark and see some lost packets (see screenshots below)

http : //ubuntuforums .org/attachment.php?attachmentid=58786&d=1202226451
http : //ubuntuforums .org/attachment.php?attachmentid=58787&d=1202226451

I turned off upnp discovery at the router device and turned of any networking program running at linux, to make it easy to debug.

Then I fired up ssh and see some lost packets at wireshark

See attached screenshots, really strange.

If you need some more info, don't be afraid to ask.

I saw other similar threads, related to usb ethernet adapter, about to turn off tulip and enable dmfe, pci=noacpi, I have already tried that, no success.

dmfe and tulipe modules are not loaded
ipv6 is disabled at linux and firefox

Those threads doesn't solve the issue or doesn't apply

I can ping DNS servers with good response times.


$ cat /etc/resolv.conf
nameserver is the router device, where it points to the following DNS

DNS 1:
DNS 2:

$ ping
PING ( 56(84) bytes of data.
64 bytes from icmp_seq=1 ttl=127 time=3.89 ms
64 bytes from icmp_seq=2 ttl=127 time=1.72 ms

$ ping
PING ( 56(84) bytes of data.
64 bytes from icmp_seq=1 ttl=252 time=10.1 ms
64 bytes from icmp_seq=2 ttl=252 time=11.5 ms
64 bytes from icmp_seq=3 ttl=252 time=16.6 ms


$ lshw -C network
description: Ethernet interface
physical id: 1
logical name: eth0
serial: 00:60:6e:50:43:a0
capabilities: ethernet physical
configuration: broadcast=yes driver=dm9601 driverversion=22-Aug-2005 firmware=Davicom DM9601 USB Ethernet ip= multicast=yes

================================================== ==

$ lsusb
Bus 003 Device 002: ID 0a46:9601 Davicom Semiconductor, Inc.


$ ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:60:6E:50:43:A0
inet addr: Bcast: Mask:
RX packets:3501 errors:542 dropped:170 overruns:138 frame:659
TX packets:2482 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1403464 (1.3 MB) TX bytes:509632 (497.6 KB)


$ cat /etc/network/interfaces
iface eth0 inet static

auto eth0


$ route -nv
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface U 0 0 0 eth0 U 1000 0 0 eth0 UG 100 0 0 eth0

================================================== ==


$ lsmod |grep dm9
dm9601 10624 0
usbnet 19976 1 dm9601
mii 6528 2 dm9601,usbnet
usbcore 138632 6 dm9601,usbnet,usbhid,ehci_hcd,uhci_hcd

================================================== ==


$ cat /etc/modules

==> /var/log/syslog <==

Feb 2 18:52:51 panzer kernel: [ 175.556000] usb 3-1: new full speed USB device using uhci_hcd and address 3
Feb 2 18:52:51 panzer kernel: [ 175.732000] usb 3-1: configuration #1 chosen from 1 choice
Feb 2 18:52:51 panzer kernel: [ 175.900000] eth0: register 'dm9601' at usb-0000:00:1d.2-1, Davicom DM9601 USB Ethernet, 00:60:6e:50:43:a0
Feb 2 18:52:51 panzer kernel: [ 175.900000] usbcore: registered new interface driver dm9601
Feb 2 18:52:51 panzer kernel: [ 175.940000] eth0: link down
Feb 2 18:53:11 panzer kernel: [ 195.524000] eth0: link up, 100Mbps, full-duplex, lpa 0x41E1

Last edited by claudio4j; 02-05-2008 at 12:46 PM. Reason: Attach screenshots
Old 02-07-2008, 01:32 PM   #2
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Registered: Nov 2003
Posts: 4

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I have solved the issue


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