Fiber connection constantly dropping - Pings returning "Reply from (PUBLIC FACING IP): Destination host unreachable"

Thank you for reaching out. We hear you, and we'd be happy to assist. 

Let's get your ping back to an acceptable level, @KyLaser

Check out our Smart Home Manager and run a home network diagnostic test. This will alert you if you are having any network errors and provide suggestions to correct it.

Don’t have the Smart Home Manager app yet? Download the app from the Apple App store or Google Play store.

We also recommend that, you attempt to reset your gateway when you notice that your ping is high. This can refresh your connection and correct any errors that may be causing this. 

You can do hard reset by following these steps:

1. Unplug the power cord from the back of your gateway or modem. If you have: 
   • An internal battery backup, remove it
   • DSL, unplug the phone cord from your modem or gateway
2. Wait 20 seconds.
3. Put the internal battery back in if you have one. 
4. Plug the power cord back in. If you have DSL service, reconnect the phone cord.
5. Wait for the gateway or modem to restart and your Broadband light to turn solid green. This can take up to 10 minutes.

Along with that, we recommend that you view our article that covers about high ping and latency.

You can also use our article on Trouble Gaming & High Ping for more troubleshooting options, some of which you may not have tried yet.

Hope this helps!

For further assistance feel free to contact us!

Mary, AT&T Community Forums Specialist.

I’ve already done all that. Didn’t work at all. 

reset both the att router and my 3rd party router. 

Replaced both routers. Reset everything 4 times with att support. 

Thank you for sharing the details @KyLaser. We understand the importance of having a stable internet connection. 

We're here to help and guide you!

Let's see "what is acceptable latency" if you are not familiar with latency. Below is the information regarding some acceptable latency.

What is acceptable latency? 

• 0 - 150ms means the connection is great
• 150 - 300ms is acceptable 
• Over 300ms may indicate an issue

AT&T's Internet Network does not place priority on ping. Ping results may be delayed and elevated due to hops not responding to the ICMP protocol of Ping. Also, some sites do not ping at the same rate. AT&T will investigate latency over 400ms. 

If you are facing the latency, only at certain time or specific period, it maybe due to Server Traffic and this depends on how many people are using the website.

If you're seeing high ping or website issues, remove all devices, test your speeds, and check to see if they match your plan. Check the website to see if there is a known issue. To determine if the issue lies with the 3rd party server, test another website. If you do not see issues with other 3rd party websites, there is a good chance the server is the issue.

Hope this helps shed some light about the concern you're facing!

Mary, AT&T Community Forums Specialist.

Clearly you all just do defaulted replies without really reading the post. You'll see I'm getting latency as high as 1444ms when the system resumes connectivity. 

So no, it doesn't help in the slightest with the concerns I am facing. 

We understand the gravity of your concern @KyLaser.

However since you state that the issue still persists, you can speak with our AT&T customer support team for assistance, please contact us at 800.288.2020. We are available Monday to Friday 07:00am-09:00pm CT and Saturday-Sunday 08:00-09:00pm CT.

We look forward to assisting you.

Mary, AT&T Community Forums Specialist.

Again.. read the post. I’ve done this, 3 times since it started. They are unable to figure it out. 

Hey again @KyLaser, 

We understand the hassle this might have caused, let's get this sorted out as soon as possible.

Since a tech visit has already been scheduled, we suggest waiting  and then update us on how things went. In the mean time, we've got something else you can try to see if your problem gets resolved.

 To fix the "Destination Host Unreachable" ping issue, you can try the following steps:

- Perform a lookback test by executing the "ping 127.0.0.1" or "ping localhost" command.
- Ping another IP or website to ensure that there is internet connectivity.
- Perform a power cycle.
- Examine issues with the destination host.
- Change the default gateway.
- Disable the firewall.
 

If the issue persists, you can try disabling the firewall and performing a tracert to the destination IP.

Let us know how it goes.

Please feel free to reach out to us for further assistance.

Thank you,

JamesR, AT&T Community Forums Specialist

Tech came, got rid of the ONT, and added the SFP port with fiber directly into the new router/modem I was sent. 

Worked perfectly yesterday. This morning it's right back to the same exact issue. 

I've already done all the above troubleshooting. It's as if your router is preventing 3rd party communication in IP Passthrough. IDK what it is, but this randomly started last week, and I'm about to cancel my ATT and go back to spectrum. At least they were reliable.