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ravenchilde

join:2011-04-01
kudos:2
reply to grafx

Re: [AB] BB50 disconnects about 1-2 times an hour

said by grafx:

since changing this i havent had a single disconnect. it appears this WAS the cause. although it surprises me.

Can you post your OS details? (Version, service packs, etc)

Maybe the OS doesn't like a 1 hr lease?

tlhIngan

join:2002-07-08
Richmond, BC
kudos:1
reply to Grafx

I wonder if it's "flapping" because something is causing the port to reset. The disconnection happens when the Ethernet PHY is forced to renegotiate the link (it takes 2-3 seconds).

This can happen if someone clicks "repair" on the interface - Windows brings the interface down and back up, which forces a renegotiation. It then does a new DHCP request to bring up the link.

Try setting your PC to use a static IP and see what happens.

What happens is if the lease is 1 hour, the PC will automatically do a lease renew when the lease is half expired. Thus at one hour, the PC will begin renewing the lease 1/2 hour in. When this happens, the DHCP server could very well send a DHCKNAK saying "renewal failed, drop your existing leases". Windows could very well reset the port (in case the network changed on it and it didn't notice - the usual cause of NAKs).

Usually caused by a subtle incompatibility between the DHCP server and client.

If static IPs work, use them (and make sure to exclude them from the DHCP range).


grafx

join:2012-03-05
T640H5

1 recommendation

reply to Grafx

Just to confirm, since changed. this problem has never returned.

SO if anyone experiences this issue. its DHCP RELEASE TIME!


ravenchilde

join:2011-04-01
kudos:2

Now we just need some more people to test this and chip in. Thanks Grafx.


kevinds
Premium
join:2003-05-01
Calgary, AB
kudos:3

I've been trying to reproduce,

I am not getting the LAN ports to cycle or turn off when doing DHCP rewews

-Posted from my phone.