Network Help

Derek Ragona derek at
Wed Feb 13 00:07:27 UTC 2008

At 01:50 PM 2/12/2008, Victor Farah wrote:
>I have a machine setup with FreeBSD 6.3-PRERELEASE setup on a 10/100/1000 
>switch.  There are a pair of em interfaces, and the network traffic on 
>this machine is very spuratic.  Both EM interfaces reach 100Mbps and falls 
>to 5~10Mbps, the very next minute, the traffic is very spuratic.  The 
>media of the interfaces is as follows:
>EM0: media: Ethernet autoselect (1000baseTX <full-duplex>)
>EM1: media: Ethernet 1000baseTX <full-duplex>
>Currently the EM1 card is in use.
>I watch an MRTG that I have setup to see the machine failing at sustaining 
>its bandwidth.
>I have 13 other machines setup the same way but traffic is running fine 
>and working very well, the only difference between those and the new one, 
>is that it's pushing much more data through it; almost the same amount of 
>data the 13 other machines push combined.

First you should update this system to 6.3 release.

Also you should post how your interfaces are configured, you can copy and 
paste the output from:
ifconfig -a

You also need to better explain the topology of your network.  For instance 
are all 13 systems on the same subnet?  or are you running multiple subnets 
with a switched backbone?  How many switches are you using?  Are you 
checking the throughput across a LAN segment or across multiple subnet 


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