Valued Participant

Short Disconnects once/twice per hour on DG1670a

We recently upgraded to the DG1670a for the new speeds TWC is offering. New speeds are great; however, while I play DOTA 2 (or even web browsing), I noticed the connection drops once or twice per hour for a period of about 10 - 20 seconds. I constantly ping 192.168.100.1 and I notice that during these events, there will be 5 - 7 pings that time out.

 

I called TWC and described the issue. They checked power levels, and they said everything looks fine. I tried putting the device in bridge mode and running it through a router, but I couldn't seem to get that working properly...regardless, I expect the device should work as intended as a router and modem concurrently.

 

Any ideas?

 

Thanks,

Alex

76 REPLIES
Rookie

Re: Short Disconnects once/twice per hour on DG1670a

Sorry about your issues sir..

 

I would recommend you disable WPS Settings, change security type to WPA rather then WPA 2, use wireless channel 1,  change becan interval from 100 to 50 / use a shorter coax cable / bypass splitter if any, or replace splitter if same issue still occures

Expert

Re: Short Disconnects once/twice per hour on DG1670a

Turnoff WPS,the WIFI guest account,IP flood detection and it's firewall. 

 

But first copy and paste the modems signal  and error log pages.

 

Seasoned Contributor

Re: Short Disconnects once/twice per hour on DG1670a

If the disconnects occur every hour, almost exactly to the minute, then I suspect a problem with DHCP lease renewal.  When computers are connected to a modem or router that assigns an IP address, the IP address is assigned for a specific amount of time, determined by the modem or router. 1 hour is the default setting for this modem.

The computer attempts to reset the lease time half way through by sending a request to the modem or router, and should normally be transparent to the user, i.e. no disconnect. If the the router or modem doesn't see the request or rejects it, then disconnects may occur.

You can check this in your computers event logs (for Windows, Control Panel > Administrative Tools > Event Viewer > System) and look for DHCP events

 

If this is the issue and you are unable to resolve it between your computer and the modem, you can work around it by logging into the modem LAN settings page and change the lease time to 604800 (7 days). The problem will still be there, but you will only see it once a week.

Expert

Re: Short Disconnects once/twice per hour on DG1670a

pinging 192.168.100.1 is stupid, it is the modem and is basicly a ping attack! You should not be doing that constantly as it ties it up. It also can indicate the problem is in your computer All in ones are junk and are plagued with issues unless they're turned back into basic modems and you supply your own router.

 

 I assume you've turned off WPS, the wifi guest account, IP flood detection and firewall in it as well as changed the dhcp address range off the illegal single last digit start to a range of 192.168.x.100 on up...

 

 

You may also need to run netstat to see what IP connections and ports your computer has as well as copy and paste the modems signal level pagges here. Marginal signals induce errors.

 

Valued Participant

Re: Short Disconnects once/twice per hour on DG1670a

Before posting here, I did disable firewall, change starting IP address, etc (everything as recommended by MsRaye). I called TWC and they mentioned power levels were ok, but I included them below, too.

 

Before posting, I also suspected it is a DHCP issue. I checked the event viewer in admin tools as suggested. Although a few DHCP events have come up, there isn't an event logged that I could attribute to one of my disconnects.

 

I decided to ping 192.168.100.1 because I was getting these disconnects, and figured out that when I ping 192.168.100.1, the requests time out during these disconnects. At the same time, 192.168.0.1 does not disconnect.

  Downstream

 DCIDFreqPowerSNRModulationOctetsCorrectedsUncorrectables
Downstream 11705.00 MHz8.60 dBmV38.61 dB256QAM118838815120
Downstream 22699.00 MHz8.60 dBmV38.98 dB256QAM62447021110
Downstream 33693.00 MHz8.50 dBmV38.98 dB256QAM8203710150
Downstream 44687.00 MHz8.40 dBmV38.98 dB256QAM4801991180
Downstream 55681.00 MHz8.60 dBmV38.98 dB256QAM5804091990
Downstream 66675.00 MHz8.30 dBmV38.61 dB256QAM54169274100
Downstream 77669.00 MHz8.40 dBmV38.98 dB256QAM3177547460
Downstream 88663.00 MHz8.30 dBmV38.98 dB256QAM2728583170
Downstream 99657.00 MHz8.30 dBmV38.61 dB256QAM3738420870
Downstream 1010651.00 MHz8.30 dBmV38.98 dB256QAM2187462950
Downstream 1111645.00 MHz8.20 dBmV38.98 dB256QAM3210483460
Downstream 1212639.00 MHz8.20 dBmV38.61 dB256QAM1760945010
Downstream 1313633.00 MHz8.10 dBmV38.98 dB256QAM43869127160
Downstream 1414627.00 MHz8.00 dBmV38.98 dB256QAM5291097150
Downstream 1515621.00 MHz8.20 dBmV38.98 dB256QAM4448127300
Downstream 1616615.00 MHz8.10 dBmV38.98 dB256QAM29819869110
Reset FEC Counters

Upstream

 UCIDFreqPowerChannel TypeSymbol RateModulation
Upstream 1930.60 MHz48.00 dBmVDOCSIS2.0 (ATDMA)5120 kSym/s64QAM
Upstream 21237.00 MHz48.50 dBmVDOCSIS1.x (TDMA)2560 kSym/s16QAM
Upstream 31123.30 MHz46.75 dBmVDOCSIS2.0 (ATDMA)5120 kSym/s64QAM
Upstream 41018.50 MHz45.50 dBmVDOCSIS1.x (TDMA)2560 kSym/s16QAM
Expert

Re: Short Disconnects once/twice per hour on DG1670a

[ Edited ]

I think you need to either get it in bridge mode and use your own router or exchange it for a different mfg modem, the levels look good... although they're snapshots taken when you hit the page, uncorrectables aren't high, they appear nonexistant. This may be buggy router firmware and not showing up on the modem log.

 

 

 

Helper

Re: Short Disconnects once/twice per hour on DG1670a

alexgarcia1987,

 

describe your wiring. specifically:

  • amplifiers?
  • splitters?
  • unterminated ports?
  • unused but attached cables?
  • residence or apartment?
  • describe wiring from twc box on side of building to all devices.
redrock in Austin, Tx
Valued Participant

Re: Short Disconnects once/twice per hour on DG1670a

No amplifiers or splitters. The TWC cable goes directly into the modem. Our only other cable from the outside is our own antenna (we don't have cable TV).

 

I just set it in bridged mode and disabled the DG1670s DHCP so my router can assign IP addresses. Everything is functional at the moment, but we'll see if it works. Also, the oddest thing...I can access every website I can think of, except for any google related websites. Why in the world would switching bridge mode make google not work (and only google)?

Valued Participant

Re: Short Disconnects once/twice per hour on DG1670a

The google thing was a coincidence. It's working now. Maybe google went down for a few minutes...

 

I noticed a huge speed drop. The router is an old Linksys WRT54G, but instead of getting almost 200 mpbs like before, I'm only getting 30 mbps.

 

No disconnects so far, though.