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This is my first post to this website. I this that my question is related to serverfault cause it is related to ethernet communication issue. If you disagree please let me know what is the appropriate place to move this post to. Thanks.

I am using USB3 to GigE converter - since I don't have GigE on my linux board. My problem is after connecting to an IP camera. It works for sometime and I am able to receive images but then it stops after one or two minutes. After it stops I cannot ping anything and I can see there are error in rx packets.
Here is my ifconfig before connecting to the camera:

ifconfig eth1 Link encap:Ethernet HWaddr 00:13:3b:99:28:56 inet addr:192.168.0.117 Bcast:192.168.0.255 Mask:255.255.255.0 inet6 addr: fe80::213:3bff:fe99:2856/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:4000 Metric:1 RX packets:102 errors:0 dropped:0 overruns:0 frame:0 TX packets:39 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:29172 (29.1 KB) TX bytes:6614 (6.6 KB)

and here is the same after connecting to the camera and stops responding:

ifconfig eth1 Link encap:Ethernet HWaddr 00:13:3b:99:28:56 inet addr:192.168.0.117 Bcast:192.168.0.255 Mask:255.255.255.0 inet6 addr: fe80::213:3bff:fe99:2856/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:4000 Metric:1 RX packets:137338 errors:1604 dropped:0 overruns:0 frame:0 TX packets:3662 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:274563593 (274.5 MB) TX bytes:287885 (287.8 KB)

Clearly there are error in RX packets, I am not sure why. Here is the ethtool eth1 output:

ethtool eth1 Settings for eth1: Supported ports: [ TP MII ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Half 1000baseT/Full Supported pause frame use: No Supports auto-negotiation: Yes Advertised link modes: Not reported Advertised pause frame use: No Advertised auto-negotiation: No Speed: 1000Mb/s Duplex: Full Port: MII PHYAD: 3 Transceiver: internal Auto-negotiation: off Cannot get wake-on-lan settings: Operation not permitted Current message level: 0x00000007 (7) drv probe link Link detected: yes
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  • Offtopic on there, more for the superuser section I think but at first I would suggest a dedicated NIC if the cam is network intensive. Commented Jan 6, 2015 at 16:48
  • Could you do some packet sniffing to try and figure out where they're coming from? Choose one of these and try and capture the moment when this happens, it might help us debug the issue a bit more efficiently. sectools.org/tag/sniffers Commented Jan 6, 2015 at 17:01

1 Answer 1

Reset to default
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I would take a look at the MTU. It may be a USB3/GigE thing, but change it to 1500 and attempt to continue:

ifconfig eth1 mtu 1500

Edit: A note - This is a temp setting which will not persist through a reboot.

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  • it didnt help :( Commented Jan 6, 2015 at 17:29
  • can you give output of dmesg? The best time to do this would be right after the issue happens. Commented Jan 6, 2015 at 21:42

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