dslreports logo
site
 
    All Forums Hot Topics Gallery
spc

spacer




how-to block ads


Search Topic:
uniqs
2704
share rss forum feed


Grafx

@shawcable.net

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

the Modem doesn't go offline... lights dont reset... nothing flashes etc..its like its complete steady connection.

the problem is that LAN connection and wireless just disconnect for about 10 seconds at most..and then are back online. Ive never had it last longer than 10 seconds.

any idea what could be causing this? its not so bad since it isn't even downtown... but interrupting downloads and games is getting rather annoying.

ilianame

join:2002-06-05
Burnaby, BC
kudos:2
Reviews:
·Shaw

1 edit
Noise issues on your local line are causing the modem to puke up and soft-reboot.

Solution: Pester tech support to issue service calls to:
1) Check the signal levels (Ignore the first reply that SNR = OK)
2) Check the building wiring
3) Check the pole hookup
4) Rewire everything up to the outlet

Things you could do yourself:

Remove any unnecessary splitters
Tighten all coaxial rings where they hook up to splitters/outlets/equipment
Make sure all cable used are appropriate gauge (thick cables)
Ensure that no coaxial wiring is wrapped around with high-voltage wires coming into premises (ludicrous)
Ensure that no coax cable is plugged into electrical wiring (lol)

etc

EDIT: I suppose I should l2read "the Modem doesn't go offline... lights dont reset... "

kevinds
Premium
join:2003-05-01
Calgary, AB
kudos:3
Reviews:
·Shaw
If the lights on the modem don't change, my first thought it not signal, but your NAT/router being an issue.

Are you using your modem in Gateway mode? Or bridged mode?

What are you using for a router?
--
Yes, I am not employed and looking for IT work. Have passport, will travel.

tlhIngan

join:2002-07-08
Richmond, BC
kudos:1
reply to Grafx
Yeah, if it's 10-30 seconds, it's most likely the router - DOCSIS takes far longer to negotiate and link up.

If you're using it in gateway mode - get it switched to bridged and get a GOOD router (not $20 crap. Expect to pay $100+ for something decent). Most likely you're doing something that exceeds its capabilities and when that happens, the router part reboots.

If you're using it in bridged mode - what kind of router are you using? BB50 demands more to handle the speeds and an old router like the WRT54G had a good run but isn't sufficient at all.

ravenchilde

join:2011-04-01
kudos:2
said by tlhIngan:

Yeah, if it's 10-30 seconds, it's most likely the router - DOCSIS takes far longer to negotiate and link up.

If you're using it in gateway mode - get it switched to bridged and get a GOOD router (not $20 crap. Expect to pay $100+ for something decent). Most likely you're doing something that exceeds its capabilities and when that happens, the router part reboots.

If you're using it in bridged mode - what kind of router are you using? BB50 demands more to handle the speeds and an old router like the WRT54G had a good run but isn't sufficient at all.

This sounds like a good test. Hook up a good quality router and see if it's just some protocol with high-connections causing resets.

tlhIngan

join:2002-07-08
Richmond, BC
kudos:1
said by ravenchilde:

This sounds like a good test. Hook up a good quality router and see if it's just some protocol with high-connections causing resets.

Apparently the test is the counterstrike test. Just load up counterstrike and bring up the server chooser - it creates a LOT of connections as it tests the latency to the server. Most cheap routers will reboot/hang/stall.

It doesn't have to be counterstrike - any multiplayer game that allows private servers and does ping tests to help you choose can be used, provided it's popular enough to have more than say, 100 servers at any time. Maybe TF2?

ravenchilde

join:2011-04-01
kudos:2
eDonkey? :P

grafx

join:2012-03-05
T640H5
reply to Grafx
I have CISCO DPC3825

Exact same issue as this guy is reporting

»homecommunity.cisco.com/t5/Wirel···p/488446

should i call shaw and ask for a new modem?

grafx

join:2012-03-05
T640H5
reply to Grafx
Called shaw..they have no idea what is causing this and i have a service call for march 13=/

ilianame

join:2002-06-05
Burnaby, BC
kudos:2
Meanwhile...

Check your physical cables, tighten the rings on coax.
Make sure the splitters/connectors are not touching anything metal.
Remove any splitters you have access to between the outlet and the modem.


ShawSean

join:2010-07-16
Vernon, BC
kudos:12
reply to grafx
When you called in, did the agent say the modem was flapping (disconnecting) at all? Did he ask you to run directly connected to test for 24-48 hours to see if the problems persist?

I have a feeling that if the actual modem isn't losing connection the service tech that's coming out won't be able to do much other than replacing your modem.

If you send me you account details I'll investigate further for you tomorrow.

Cheers.
--
Sean
Twitter - @Shaw_Sean


tekashr

@shawcable.net
reply to grafx
Try the SMC. Thats what I did and it fixed everything


tekashr

@shawcable.net
SMC mdm that is.


grafix

@grouptelecom.net
reply to ShawSean
@ShawShean

The computer that is disconnecting is DIRECTLY connected to the modem. It's wired. always has been since day of installation.

The wifi doesnt disconnect. the modem lights dont disconnect. Just lan shows disconnected for about 2 seconds. Happens randomly. In an 8 hour period could happen 3-8 times. varries once every 1-2 hours. Ive tried diff ports, diff ethernet cables, changed coaxiles everything. diff computers wired directly dont change anything.

with telus and rogers ive never experienced this. and yes im assuming the tech will just swap out the modem.

has this ever been reported with this modem?


ShawSean

join:2010-07-16
Vernon, BC
kudos:12
grafx - Could you pm me your account details? I'll have a senior tech contact you to troubleshoot further.

Cheers.
--
Sean
Twitter - @Shaw_Sean

grafx

join:2012-03-05
T640H5
reply to Grafx
ive changed client lease time from 60 minutes to 9999 minutes. havent DC'ed since.. but might just be luck right now


ShawSean

join:2010-07-16
Vernon, BC
kudos:12
Interesting, keep me posted on your results.

Cheers.
--
Sean
Twitter - @Shaw_Sean

ravenchilde

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

ive changed client lease time from 60 minutes to 9999 minutes. havent DC'ed since.. but might just be luck right now

Is that the client DHCP lease time on the DPC3825?

kevinds
Premium
join:2003-05-01
Calgary, AB
kudos:3
Reviews:
·Shaw
reply to grafix
The computer's LAN showing disconnected for 2-3 seconds is definately interesting,

Wonders if the port flaps each time the DHCP request is renewed...

If this is the case, wonders what happens if I connect a 48 port switch with hosts to that port, if the port still continues to flap each time a request happens.

I'd replace the modem and see what happens after, very weird that changing the lease time appears to have fixed this.
--
Yes, I am not employed and looking for IT work. Have passport, will travel.

grafx

join:2012-03-05
T640H5
reply to Grafx
since changing this i havent had a single disconnect. it appears this WAS the cause. although it surprises me.

ravenchilde

join:2011-04-01
kudos:2
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.