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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

Brand User
ATTHelp

Community Support

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128K Messages

2 years ago

Hi There @ThaDuckmasta

 

We understand that you are having problems with your AT&T(BGW 210-700) equipment set in IP passthrough, to your Netgear R7000.  We can look at that.

 

Normally, when it comes through IP passthrough the AT&T router, is just the tunnel. The IP address that it is assigned goes right through the AT&T equipment right to the Netgear.  

 

Now you did mention that you cleared the crashing issue with the Netgear by doing the latest firmware update.  That is a good thing.  You also mentioned that the AT&T equipment 'hiccups'.  That is what we need to look at. 

 

When the AT&T equipment 'hiccups', do any other the lights go out or turn red?

 

Does the AT&T equipment restart on its own?

 

Have you gone through and done a factory reset on the AT&T router and re-setup the IP passthrough again on the AT&T equipment?

 

To factory reset the AT&T equipment please follow these steps: (Please note that any special settings or configurations will revert back to like they have not been done):

Reset your gateway

Heads up: Be sure to make note of any custom settings, like your static IP address if you have one, or your Wi-Fi® network name (SSID). You can then reapply them after the factory reset.

  1. Press and hold the Reset button on the gateway for at least 10 seconds. If you let go before 10 seconds, the gateway will reboot, but it won’t reset.
  2. Wait until the gateway restarts and all the status lights are lit. 
  3. See if the Broadband or Service status lights are solid green. If so, the reset succeeded

Then you will need to re-set up IP passthrough back into the AT&T equipment. Do make sure that you have the Netgear removed from the configuration during this reset.

 

If the reset doesn't clear up the problem, please let us know, so we can take another stab at the problem. 

 

Matthew, AT&T Community Specialist

 

 

Still need help? Ask a question! Our 1.4 million members typically respond within 1 hour.

*I am an AT&T employee, and the postings on this site are my own and don't necessarily represent AT&T's position, strategies or opinions.

Contributor

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2 Messages

a year ago

Hi Matthew,

 

Thanks for your reply.  It is good to be discussing the issue with someone.

 

I agree that the issue that needs addressing is the "hiccup," as I call it.  To answer your questions, when this occurs on the network, there are no visible signs on the modem--the lights do not change and it does not reboot itself.  I have indeed attempted a factory reset twice, with no effect on the issue.  I also did a factory reset on my router with no effect.

 

I finally contacted support.  A technician was sent out and he ran various tests, all of which showed no issues.  He did note that the exterior ONT device was an older one and he decided to replace it, but didn't have much confidence it would make any difference.  Indeed, the issue continues.

 

I decided to switch from using my Netgear router to using the built-in functionality of the BGW210-700 to see if the issue still occurs.  Right now, IP passthrough is disabled and my Netgear router is configured just as an Access Point.  I believe I am observing the same behavior, though--traffic stalling for 10-15 seconds--but it's hard to say definitively.  Now, instead of hundreds of errors in the log stating "Invalid IP packet," there are still dozens, but lots of other entries labeled as "generic discard".  I can see that the 5ghz network has hundreds of "Receive Error packets" and "Transmit discard packets" logged.  I am unsure of why there would be any dropped packets, unless this just reflects outside access attempts that are blocked (like pings or port scans).  Either way, I want to continue using my own router, so I need to find a solution...

 

Speaking with support, I was informed that the firmware on the modem was updated recently, and looking at other forum posts, the latest version (1.8.18) was released in either late December or early January, which is around when the issue started.  This seems to be the most likely cause.  A few questions:

 

1. Are there any known issues with firmware version 1.8.18 that could be causing this?

2. Is it feasible to rollback the firmware to an earlier version, since I had no issues at all for nearly a year?  if so, can a link be provided to this?  Also, is it possible to disable automatic firmware updates on the device?

3. Is it possible to get a different modem from AT&T that does not have any router functionality?  I had a standard modem with Comcast for several years and had zero problems with it.  Since I intend to use my own router, it seems like having the built-in router functionality is more trouble than it is worth.

 

4. (random thought) Even with IP passthrough enabled, the modem seems to be performing NAT, which my router is also doing, which may be causing a double NAT situation.  Is it possible to directly disable NAT?

 

Thank you for any help you may be able to provide!

Contributor

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1 Message

a year ago

I'm having very similar issues - did you hear from AT&T about rolling back firmware to an earlier version?  

Contributor

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1 Message

a year ago

I am also suffering from this issue since at least December to the best of my memory; however, I am not using any equipment beyond the AT&T-assigned BGW210-700. It acts as both the modem and router. It is extremely frustrating to know I have the bandwidth and speed, but AT&T's awful equipment is cascading issues across my home network that they are unwilling to resolve. To AT&T: It's disingenuous to mark this as "Solved" when no notably action has been taken to solve this issue, as we are still here experiencing it and discussing it.

 

Has anyone manage to circumvent this issue?

d3monkid12

Mentor

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78 Messages

a year ago

so where is this solved?  I need to know how to fix. please help

Voyager

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2 Messages

a year ago

Did anyone get a solution to this.  This is the exact problem I am having there was a tech yesterday changed the modem again.. I've only had service for a month and this had been going on the entire time..I realised today that this is what's happening

d3monkid12

Mentor

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78 Messages

a year ago

Unfortunately no. At&t still has not addressed the problem and the reply that was marked as solved did not fix the problem. If you happen to come across a way to fix/resolve this issue please, please, please pass along the information I would very much appreciate it

Contributor

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2 Messages

a year ago

my internet connection is constantly dropping and i also get invalid ip packet and generic discards in my logs.

 

i will try resetting the router.

Contributor

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2 Messages

a year ago

having exact same issues.

d3monkid12

Mentor

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78 Messages

a year ago

Did that. And the problem still happened. I've bought 3 different brands ( brand new) and still the problem remains so resetting isn't going to help 

d3monkid12

Mentor

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78 Messages

a year ago

This is not a solution. And was not accepted by anyone that was even taking part in the discussion. We need a solution

anatolyk

Teacher

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17 Messages

a year ago

Isn't this disgusting Firewall in disabled state having mind of its own and no reaction from ATT? Multiple similar issues in this forum on BGW210 "disabled firewall" interfering with legitimate traffic  go back to Nov 2018. Support line is mostly clueless about the issue. If one gets lucky to speak to 2nd tier, they admit the issue but have no solution or estimated time to fix. Even more irony is in reading responses from ATT sharing the 1-800 number for their paid support. Folks there are not any better in resolving firewall issue that 1st tier.

 

How hard is this to get that disabled firewall must not drop packets? 

DavidCS

Community Support

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1.7K Messages

a year ago

Hi @d3monkid12 and @anatolyk ,

 

With the gateway reporting an invalid IP packet, it could be several different issues, but is usually not due to strict firewall settings. The most common cause are corrupt packets, which happens. There are billions of packets that get transmitted, and at times they do end up corrupted. This is usually not a problem because routing protocols recognize that a packet was not transmitted and requests for it to be retransmitted. However, if you do get too many errors, you do run into issues like what the poster experienced where the router gets flooded with these requests. The best way to deal with this issue is to troubleshoot the connection issues, such as possible issues with your services (test with removing all 3rd party equipment and seeing if you experience the same issue with just the gateway), isolating the connection (test with a minimal setup to make sure that it is not a device that is causing this issue). If still experiencing problems, please provide a little more detail on what issues are happening, such as high latency or complete internet disconnects, and a little background on your home network setup.

 

David, AT&T Community Specialist

If you encounter any issues with your service or equipment, I recommend checking out our Troubleshoot & Resolve solutions to help diagnose the issue.
*I am an AT&T employee, and the postings on this site are my own and don't necessarily represent AT&T's position, strategies or opinions.
d3monkid12

Mentor

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78 Messages

a year ago

Let me start by saying that I've been dealing with this problem for 2 years now, at least. I have been over the trouble & resolve tool more times than I care to even think about. I have removed all but the single reason for having an internet connection in the house (xbox). I have tried wired connection and wireless and it makes little to no difference. AT&T has sent the tech out 3 different times to check the lines and my whole setup. I have swapped out gateways 3 times before acquiring one on my own I went out and bought whole new setup so that everything could be connected to something that had never been setup for anything else before. Meaning brand new gateway, brand new route and brand new xbox one x. But nothing changed the outcome. As many times as I've called and chatted with people at at&t i have no doubts at all that there is something wrong with how the gateway is now set up because they are always doing things and not saying anything about what they did not realizing that there's all kinds of changes that they could have messed up by changing something else. Like one time i had called to get help opening ports, "oh yeah i help you hold on one moment." Says the gu . About 5 minutes later he gets back on and says "ok i opened the ports for you will there be anything else?" I hadn't even told him which ports or anything like that. I asked him what he did because I didn't want my xbox to be dmz. Which is exactly what he did. Before I had called that day, i had just finished taking my xbox out of dmz because Microsoft had said that that could be what was causing the problem. I know that they have changed other things when I've told them not to so now theres no telling what is even right anymore. I know i can play online and have an open NAT right now but if i showed you how the setup pages for my gateway and router look right now you wouldn't believe i have an open NAT. I'm no networking or computer wiz at all but i know i shouldn't be having these problems. Problems are mainly, major packet loss, high ping, random disconnects, and speeds well below what I'm subscribed for, which is AT&T12. Here's a couple screenshots of a speed test done on the att website, a partial screenshot of the log from my gatewat (I've blurred out my IP address) and a pic of what my xbox says it's receiving from the gateway. I'll give whatever info i can that may be needed to solve this issue 20190802_142817.jpg

 

20190806_125758.jpg

 

20190429_010933.jpg

 

DavidCS

Community Support

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1.7K Messages

a year ago

Hi @d3monkid12 ,

 

Thanks for all the information. I'd be happy to look into this more. With the speeds showing that low, I'm thinking the real problem is somewhere else. Usually, you won't see low speeds with just the gateway unless there is a defective gateway, but I doubt that's the case, since it's been replaced multiple times. I'll be sending a private message to you.

 

David, AT&T Community Specialist

If you encounter any issues with your service or equipment, I recommend checking out our Troubleshoot & Resolve solutions to help diagnose the issue.
*I am an AT&T employee, and the postings on this site are my own and don't necessarily represent AT&T's position, strategies or opinions.

New Member

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1 Message

@DavidCS

I have this same issue and no help

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