ThaDuckmasta's profile

Contributor

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2 Messages

Thursday, February 7th, 2019 3:41 AM

"Invalid IP Packet" displayed in logs constantly and passthrough router has problems

For several weeks, my home router (Netgear R7000) has been crashing multiple times a day.  It starts dropping connections to devices and becomes completely unresponsive.  I have to power cycle it to get it working again for several more hours before the next crash.  Finally, Netgear released a firmware update, which I installed.  The all-out crashes stopped, but now the router's connection to the internet through the AT&T Arris BGW210-700 will "hiccup" a few times a day--by this I mean that the connection will drop for about 10 seconds.  If you are streaming something or otherwise doing something that requires a consistent connection, it will drop and then restore after 10-30 seconds, but I don't have to power cycle it anymore.  

 

I was convinced the issue was my router, but I now think it may be a setting on the AT&T modem.  The logs in my router, which I previously could not get to when it locked up because they got cleared out, show "Internet disconnected" and then "Internet connected" about 1 second apart, which is when those network hiccups occur.  Viewing the Arris modem logs, every day there are hundreds of entries showing "Invalid IP Packet" entries that show my network as the source and any series of destinations that don't seem to have a pattern.

 

The modem is set to "IP Passthrough" but I could not figure out how to set up the "Cascaded Router" setting so that the modem is better configured for having a second router attached.  But I also had not changed any settings on the modem for nearly a year before I started having the daily router crashes.  I tried disabling the modem firewall settings, but it made no difference.  Many of the "Invalid IP Packet" entries initially were showing IPv6 addresses, so I tried disabling IPv6 on the modem, in case there was some conflict, but it did not help.

 

I think it is likely that some firewall setting or some setting that conflicts with my Netgear router is causing this, but I cannot pinpoint it, especially since, as I mentioned, I did not change anything on the modem when the issue cropped up.  Have you experienced this issue?  Do you have any recommendations for better configuring the modem to simply be a passthrough to my Netgear router?

ACE - Professor

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5.3K Messages

5 years ago


@d3monkid12 wrote:

Which tables? Under the broadband tab in my gateway it has status and configure tabs. Under the diagnostic tab it has NAT table, sys log, & logs. I'm not sure which one you want to see


 

Here's an example from mine.

 

Annotation 2019-09-03 135053.jpg

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Contributor

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1 Message

5 years ago

I've been having the same issue since May.  Changed out gateway, disconnected extra devices connected to gateway, tech reduced our speed....and nothing.  Today I am having a new buried line connected.  I'll let you know if it works. 

Mentor

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78 Messages

5 years ago

20190905_012134.jpg

 

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ACE - Professor

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5.3K Messages

5 years ago

@DavidCS 

Does this look okay to you?

Community Support

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1.7K Messages

5 years ago

Thanks for sharing that. It actually looks pretty amazing considering how the Downstream and Upstream rate are so close to the max attainable. My guess is that you are pretty far, so that's the best max attainable you are going to get. The Errored Seconds are definitely a problem, and is probably due to the distance. If there were minor interferences or issues, we would see more FECs.

Sadly, my suggestion would be to downgrade your internet speed for more stability. From the information you provided though and looking at this router log, I am thinking that you can probably leave it as is, since 379 Errored Seconds is not worth halving your internet speed. There may be other issues, because this indicates that within a 24 hour period, only 6 minutes and 19 seconds were showing issues, but it sounded like the problem was definitely happening more than that.

 

David, AT&T Community Specialist

Mentor

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78 Messages

5 years ago

This is ehat its like while trying to download a game with nothing else on my network. 30% into the download after 3 and a half hours 20190910_211203.jpg

 

15681695766551408265811787561550.jpg

 

2 Attachments

ACE - Professor

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5.3K Messages

5 years ago

The bandwidth is total and is shared for all users.  

New Member

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12 Messages

2 years ago

In my case, the root cause was IP Passthrough. If I disable it I don't have issues. But now I am getting double NAT which I don't want.

ATT please fix IP Passthrough and allow us to use your BGW320-505 as a true bridge.

Pingplotter was a great too proof all this

With IP passthrough

In the graph above you can see how even I have IP passthrough enabled it keep going to the double NAT!!! WHY

Community Support

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230.7K Messages

2 years ago

We are here to help you with your double NAT, luflores.

 

Here is more information on how to correct the double NAT on your gateway when it is in IP Passthrough mode.

 

We recommend that you make sure that Wi-Fi is disabled on your gateway. You can then connect the third party router to your AT&T gateway with an ethernet cable to support your speeds.

 

Let us know if this helps.

 

Marc, AT&T Community Specialist

New Member

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12 Messages

2 years ago

@ATTHelp 

1. Router reset

System information

2. Disable wireless

AS you can see, speed, is not an issue. Disconnects every ~5min for 30sec are the big issue here. This only happens if passthrough is enabled. This used to work a few months back and then start behaving like this. 

Why I am still seeing double NAT in the ping plotter if I have passthrough enabled?

If I disable passthrough and do double NAT, which I do not want to do for certain applications, no disconnect is experienced.

Please help fix this

(edited)

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