Linksys Wireless Router and Dropped Cable Modem Connections
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From: John Navas on 6 Aug 2010 18:22 On Fri, 6 Aug 2010 14:06:32 -0700 (PDT), in <c8e89f47-b4fe-4ba6-99b8-d68e35f661ac(a)p11g2000prf.googlegroups.com>, three-eight-hotel <todd(a)thepetersonranch.com> wrote: >> ergo, yourcablemodemis *NOT* dropping out, so it's thewirelessrouter >> that does.... >> don't understand how you can even wonder which (cablemodemor wrt) it is, >> when you state very plainly it (cablemodem) works.... if it was thecablemodem, it would drop out when connected to your pc >> too.....- Hide quoted text - > >I don't believe I ever suggested it was the cable modem. I actually >have suspected it to be the wrt all the time... I simply asked, "Is >it the wireless router? Is it the cable modem? Is it a combination >of both???". I was mostly wondering if there was a compatibility >issues with the modem and the router. You said, "... the cable modem seems to get knocked off-line" That sounded like you thought it was a cable modem issue. Still does. Part of the problem is that your description was and is vague. -- John "Assumption is the mother of all screw ups." [Wethern�s Law of Suspended Judgement]
From: John Navas on 6 Aug 2010 18:23 On Fri, 06 Aug 2010 12:58:34 -0700, in <8c37raFpe8U2(a)mid.individual.net>, Mike Easter <MikeE(a)ster.invalid> wrote: >three-eight-hotel wrote: > >> The problem is that the cable modem seems to get knocked off-line, a >> lot! Sometimes, several times an hour! > >Maybe your provider is throttling your usage that way. > >If you are being a bandwidth hog on your neighborhood's last mile, they >should do something about it. Unlikely -- throttling is usually much more sophisticated than that. -- John FAQ for Wireless Internet: <http://wireless.navas.us> FAQ for Wi-Fi: <http://wireless.navas.us/wiki/Wi-Fi> Wi-Fi How To: <http://wireless.navas.us/wiki/Wi-Fi_HowTo> Fixes to Wi-Fi Problems: <http://wireless.navas.us/wiki/Wi-Fi_Fixes>
From: Jeff Liebermann on 7 Aug 2010 13:33
On Fri, 6 Aug 2010 08:38:22 -0700 (PDT), three-eight-hotel <tbpeterson(a)gmail.com> wrote: >The problem is that the cable modem seems to get knocked off-line, a >lot! Sometimes, several times an hour! Divide and conquer. You have 5 different points of failure and you're testing them all at the same time. There's the cable modem, the WRT54G, the wireless connection, and interconnecting cables and coax. There might also be a problem with your test computer, but I'll assume that it happens to all machines on your network. With several disconnects per hour, this should be easy. First take the wireless out of the picture. Find a CAT5 ethernet cable and plug it directly into the WRT54G. If the problem magically goes away, you have a wireless problem. It could be bad router. Please disclose the hardware version of the WRT54G. It's on the serial number tag. v5 and v6 drove me nuts with flaky operation. It might be old or bad firmware. If you have another model router available, it's easy enough to substitute and retest. It might also be wireless interference from other users of the 2.4Ghz band. It's not just other wireless networks that cause problems. There's a wide variety of 2.4GHz RF emitters that can cause problems. <http://wireless.navas.us/wiki/Wi-Fi#Interference> Lately, 2.4GHz wireless security cameras are my main headache. In the past, it was cafeteria microwave ovens and RF induction heaters that drove me nuts. Next, check or replace the CAT5 cable that's run between the cable modem and the WRT54G. If it looks home-made, replace it. Next, plug your computer directly into the cable modem. No router and no wireless. If the problem magically goes away, there's something wrong with WRT54G. Incidentally, check the WRT54G power supply for overheating. I've had a few of the linear (non-switcher) variety die on me. Before they go to no-output mode, they became intermittent causing numerous unscheduled reboots. Watch the lights and see if this is the problem. If problems persist when plugged directly into the cable modem, it's time to check the coax cables. I recently fixed a motel wi-fi system by simply replacing all the crappy coax cables (with miserable connector crimps) and reconfiguring the maze of power dividers. Go to: <http://192.168.100.1> and you might see the signal levels go up and down as you thrash on the coax cables. Don't assume your SB5120 is perfect. I've replaced a few of those (usually with a later model SB5101) and fixed performance and disconnect problems. Check the numbers on the signal level page, especially the line levels and SNR. After that, it's time to call the cable company. Last year, I had difficulty convincing them to make a service call until I walked over to the connection box, and found that it had been rammed by a vehicle and was now full of water. -- Jeff Liebermann jeffl(a)cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |