Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[skrawn]

Hey all, I started having an issue with my modem earlier this week where drawing a large amount of bandwidth will cause it to crash. I called up my ISP (Mediacom) yesterday and had someone over to swap the modem out, but the problem is still there. The only solution I was able to find is if there is a direct link to the modem from my computer (ie, not connected to router anymore) then the modem never shuts down. I have no idea what on the router could cause the modem to shut down under heavy loads. And the loads I am describing are anything from streaming HD videos to downloading game through Steam. Normal web browsing is fine though. Any ideas what I can do on the router (or configure on the modem; it's an RCA DCM425) to keep this from happening?

[skrawn]

Also, here is the error log presented by the modem when it crashes:

 Time     Priority     Description
 Sat Oct 01 14:11:14 2011      Notice (6)     TLV-11 - unrecognized OID
 Sat Oct 01 14:11:13 2011      Critical (3)     DHCP WARNING - Non-critical field invalid in response.
 Sat Oct 01 14:10:59 2011      Notice (6)     TLV-11 - unrecognized OID
 Sat Oct 01 14:10:58 2011      Critical (3)     DHCP WARNING - Non-critical field invalid in response.
 Sat Oct 01 14:10:42 2011      Critical (3)     Received Response to Broadcast Maintenance Request, But no Un...
 Sat Oct 01 14:10:09 2011      Critical (3)     Started Unicast Maintenance Ranging - No Response received - ...
 Sat Oct 01 14:09:59 2011      Error (4)     DCC-ACK not received
 Sat Oct 01 14:09:58 2011      Critical (3)     Started Unicast Maintenance Ranging - No Response received - ...
 Sat Oct 01 14:09:57 2011      Error (4)     DCC-ACK not received
 Sat Oct 01 14:09:56 2011      Critical (3)     Started Unicast Maintenance Ranging - No Response received - ...

[FurryNutz]

Really havn't see a router crash a ISP modem, only if maybe the LAN cable is bad.

Does the ISP modem exhibit the same thing while directly connected to the PC?

Some Info:
What HW version is your router?
What FW version is currently loaded?

What ISP Service do you have? Cable or DSL?
What ISP Modem do you have? Stand Alone or built in router?
What ISP Modem make and model do you have?
If this modem has a built in router, it's best to bridge the modem. Having 2 routers on the same line can cause connection problems.

Ensure DNS IP addresses are being filled in under Setup/Internet/Manual?
Turn off QoS options.
Turn off Advanced DNS Services if you have this option under Setup/Internet/Manual.
Turn on DNS Relay under Setup/Networking.
Setup DHCP reserved IP addresses for all devices on the router.
Ensure devices are set to auto obtain an IP address.
Set Firewall settings to Endpoint Independent for TCP and UDP.

[skrawn]

Really havn't see a router crash a ISP modem, only if maybe the LAN cable is bad.
Swapped the cables around, but that wasn't the issue.

Does the ISP modem exhibit the same thing while directly connected to the PC?
Not as far as I can tell. I ran a large download for about an hour and the modem never crashed.

Some Info:
What HW version is your router? - B1
What FW version is currently loaded? 2.03NA

What ISP Service do you have? Cable or DSL? Cable
What ISP Modem do you have? Stand Alone or built in router? Stand-alone modem
What ISP Modem make and model do you have? RCA DCM425
If this modem has a built in router, it's best to bridge the modem. Having 2 routers on the same line can cause connection problems.

Ensure DNS IP addresses are being filled in under Setup/Internet/Manual? Pri: 204.194.232.200 Sec: 204.194.234.200
Turn off QoS options. Check. Traffic shaping too?
Turn off Advanced DNS Services if you have this option under Setup/Internet/Manual. Check
Turn on DNS Relay under Setup/Networking. Already enabled
Setup DHCP reserved IP addresses for all devices on the router.Reserved all relevant devices
Ensure devices are set to auto obtain an IP address.Check
Set Firewall settings to Endpoint Independent for TCP and UDP. Check

Thanks for the suggestions. I have applied all of your recommended settings but the modem is still crashing. Any more ideas?

[Hard Harry]

Define crashing? I think its more likly the modem is doing what its doing both ways, you only notice the problem when the router is hooked because the "crashing" disrupts the connection between the modem and router that doesn't effect the connection between the modem and PC. It looks like your DS is losing it's frequency lock, and thats causing the modem to try to scan to relock. I would guess your DS SNR is low. What are your signal levels?

[skrawn]

Define crashing? I think its more likly the modem is doing what its doing both ways, you only notice the problem when the router is hooked because the "crashing" disrupts the connection between the modem and router that doesn't effect the connection between the modem and PC. It looks like your DS is losing it's frequency lock, and thats causing the modem to try to scan to relock. I would guess your DS SNR is low. What are your signal levels?

Crashing in that during a download, I am getting full speed, and then it rapidly drops to zero, drops connection, then power cycles itself and reboots (all LED's off, then sequentially light up like an actual power cycle). It's constantly repeatable too; I simply start a download in Steam, and it crashes within 20 seconds - 2 minutes. If I bypass the router, it never crashes. The signal levels are great actually:

SNR: 41dB
Rx Signal Strength: +4.0dBmV
Tx Signal Strength: 46.7dBmV

It's gotta be some router setting not playing nice with this modem.

[FurryNutz]

Yes turn off ALL QoS options even the ones that are grayed out, you'll have to temp enable QoS to disable all features before turning off the QoS Engine.

I would also check cabling to be sure that the cable between router and ISP modem are good. Ones that come in the box aren't the best. I prefer to use CAT6 as it's cheap now days.

Let us know, maybe someone can help you review the router settings with you on teamviewer.com.

[skrawn]

Yes turn off ALL QoS options even the ones that are grayed out, you'll have to temp enable QoS to disable all features before turning off the QoS Engine.

I would also check cabling to be sure that the cable between router and ISP modem are good. Ones that come in the box aren't the best. I prefer to use CAT6 as it's cheap now days.

Let us know, maybe someone can help you review the router settings with you on teamviewer.com.

Ok, still no dice with the QoS options. I am using Cat5 cabling, and I ordered a short length of Cat 6, just for kicks. Also have a cheapo Netgear on the way to see if it really is the DLink router. Just so odd that it would work fine for 2 months and suddenly cause issues with a device that it has been paired with all along.

[FurryNutz]

Ya this an odd problem.
Might have someone on here use teamviewer.com and review your router settings with you to be sure.

[Hard Harry]

If you do, check out his internet sessions with the router in place. Maybe you have a virus or something on your network that is creating too many sim connections, that when in conjection with your PC doing a big download, it crashes the modem.

I would also check the logs of the modem. Its possible that its happening when the router is there or not, but when the router isn't there it's not actually dropping connection so your not thinking to look at the modem.

Those are my two guesses. Furry, let me know how it goes.  Could also be a firmware bug in the modem.