Re: [SLE] Collisions with cable-modem.

On Tuesday 12 September 2006 3:20 pm, pelibali wrote:

On my router having connection to our internal net through a hub and
to the internet via a cable-modem, has constantly collisions on both
ethX interfaces. I'm not surprised that the interface serving as
internal card (eth1) has such collisions, mainly of the hub (3com,
10/100Mbit), but what could cause collisions on the other side, where
the cable-modem is attached directly to the other network (3com,
10Mbit) card?!

[EXTERNAL]
eth0 Link encap:Ethernet HWaddr ...
collisions:318 txqueuelen:1000
RX bytes:103138366 (98.3 Mb) TX bytes:7812964 (7.4 Mb)
[INTERNAL]
eth1 Link encap:Ethernet HWaddr ...
collisions:967 txqueuelen:1000
RX bytes:8555315 (8.1 Mb) TX bytes:85215436 (81.2 Mb)
You need to give us a bit more on your net topology and your traffic.
Collisions are a natural result of network traffic, and you might expect to
see some on the internal network, especially when you have a hub. I'm
seeing zero collisions on my desktop and laptop systems connected through a
switch here at work. (SuSE 10.0/ SuSE 10.1)

At home, I have a 4 port linksys router connected by wire to my desktop and
my wife's desktop and I also see zero collisions eventhough I know my wife
is probably getting an online feed. (SuSE 10.0)
collisions:0 txqueuelen:1000
RX bytes:1165493406 (1111.5 Mb) TX bytes:690752887 (658.7 Mb)
Interrupt:10

If you have a number of busy systems connected to the hub, and a number of
them are actively using the Internet, especially to download, you then
might see them on both side, especially if your network cards are half
duplex. You are almost certainly half duplex on the hub side even with your
10/100 card. It looks like the cable modem side is an older 3com that may
not support full duplex.

If your 10Mb card is running half duplex, then upgrading to a better card
may improve the situation. On the hub side, the speed of the network is
dependent on the slowest card attached to the hub, so if you have an older
card on one of the systems on the hub side, your network could be running
10Mbps half duplex. You can fix this by replacing the hub with a 10/100
switch. This is one of the main benefits of a switch in that it allows each
system to connect to the switch at its best connection rate.
--
Jerry Feldman <gaf@xxxxxxx>
Boston Linux and Unix user group
http://www.blu.org PGP key id:C5061EA9
PGP Key fingerprint:053C 73EC 3AC1 5C44 3E14 9245 FB00 3ED5 C506 1EA9

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