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Contributor

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2 Messages

Thu, Feb 7, 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?

Responses

gr8sho

ACE - Professor

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2.1K Messages

a year 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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*I am not an AT&T employee, and the views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.

Contributor

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1 Message

a year 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. 

d3monkid12

Mentor

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78 Messages

a year ago

20190905_012134.jpg

 

gr8sho

ACE - Professor

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2.1K Messages

a year ago

@DavidCS 

Does this look okay to you?

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*I am not an AT&T employee, and the views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.
DavidCS

Community Support

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1.7K Messages

a year 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

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d3monkid12

Mentor

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78 Messages

a year 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

 

gr8sho

ACE - Professor

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2.1K Messages

a year ago

The bandwidth is total and is shared for all users.  

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madmax988

Scholar

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195 Messages

@gr8sho 

@DavidCS 

I'm having the same issues as the OP. you can see more details on my forum post  https://forums.att.com/conversations/att-internet-installation/technician-made-my-internet-worse-crc-errors-fec-errors-severely-errored-seconds/5eeea4e272a09d3eb8a52a74 

 

I also have a bgw210-700 and an netgear r7000p.  I've had the bgw210-700 replaced.  I've disconnected the r7000p and the issues remain the same. I have the r7000p setup as an access point, so it's not an issue with ip passthrough or anything like that.  I went through 2 techs to fix line quality.  1st tech added an extra ground wire outside, and messed up connection on line 2 (i'm on a bonded pair 50/10 connection), told me it was as good as its going to get and refused to come back.  2nd tech respliced the wires which of course got rid of my errored seconds and CRC errors that 1st tech claimed were "normal".

 

BUT... the random disconnects still continue.  It's exactly like OP described.  Any device actively using internet connection at time of disconnect, has to be restarted(or at least the NIC of device has to be restarted).  Other devices not actively using internet but connected to gateway aren't affected.  

 

My most recent test has been disabling ipv6 on the bgw210-700 and after 3 days it seems to be more stable, but I'll need a longer test to confirm if that fixes it.

 

Is there any negatives or issues with disabling ipv6?  Any other ideas what the problem/solution could  be?

 

It's really annoying, It's been going on for me since March 2020 (I guess we should use years since the issue hasn't been fixed in over a year apparently).  The tier 1 offshore tech support is completely worthless for anything that isn't a checklist, the techs who come out are just trying to get done as quickly as possible with as little work done as possible.  

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