91–100 of 141 posts
I'm actually surprised by all of the comments. The community jumped right into solving OP's problem and has largely ignored the OP's original question of "how could I begin investigating this?" Another variation of this question could be "how do I troubleshoot complex network issues?" After 20 years of network/system/software engineering across a wide variety of network sizes and levels of complexity, I teach people…
Earlier quoted context omitted.
On the subject of Lease Time. My router is currently showing a lease time of 3 Min. I think most router tends to renew their IP at 50% of ISP's lease time ( in this case 6 min ) What are the purpose of these ridiculously low lease time? I remember in the old days they tend to go for 48 hours if not longer.
To get you to pay more money for a static IP.
And apology for asking an off topic question. I guess that is what the downvotes are coming from.
1. Unplug your Router at some other time, for at least 5 minutes, long enough for your ISP to notice it's absence and give you a different IP address. If your 3:40 PM changes, it's the 24 hour expiration of your external IP. 2. Do a ping 8.8.8.8 from your Linux machine (Raspberry Pi) or ping -t 8.8.8.8 from windows, and watch what happens at 3:40 PM 3. As others have said, turn off uPnP
I'm actually surprised by all of the comments. The community jumped right into solving OP's problem and has largely ignored the OP's original question of "how could I begin investigating this?" Another variation of this question could be "how do I troubleshoot complex network issues?" After 20 years of network/system/software engineering across a wide variety of network sizes and levels of complexity, I teach people…
The Universal Troubleshooting Process has been a web site since the mid-90s: http://troubleshooters.com/tuni.htm
Earlier quoted context omitted.
To get you to pay more money for a static IP.
Seems Reasonable, but I though most ISP dont want Home users to be using Static IPs. And apology for asking an off topic question. I guess that is what the downvotes are coming from.
But the other part is money... why give something away for free when you can make it a "feature" to pay for?
Tons of other reasons in various articles...
https://www.online-tech-tips.com/computer-tips/ott-explains-...
https://superuser.com/questions/590391/why-do-isps-change-yo...
Earlier quoted context omitted.
I had this exact issue in 2008 in SF on Comcast Business. The lease would be dropped and renegotiated every few hours, we could notice it because our SSH tunnels would get torn down. What was annoying was that the business plan had a static IP associated with it, presumably managed by their DHCP setup. It took weeks to convince Comcast the issue wasn’t in our building, and moments for them to fix once they “got it”.
What piece of evidence or logs finally convinced Comcast that the issue was on their side?
In doing some of my own network investigating recently, I discovered that services like Suricata will (by default) take down network interfaces and restart them when they get new rules. I wonder if something software on your router is doing something similar: Are you running Suricata or Snort?
Also: Logs are your friend. If you have access, review the logs of your firewall / router / etc.
My experience partially confirms that. I had an ISP who would redirect every syn packet on 80/443 to internal “low money” site in the night, but I had to reset my router after sending them money, cause otherwise that crippled session got stuck at their hardware until next autoreset.
1 minute may be a technical pppoe cleanup/reconnect timeout. Some shitty ISPs reset this timeout even for unsuccesful attempts, and this deadlock can last for half an hour until e.g. a router decides to back off for a while. Could be cured by turning it off for 3-5 minutes to cool off the ISP side. It’s rare these days.
Some german ISPs used to force a reset of home internet connections every 24h to trigger IP changes so that static IPs would remain reserved for the business tier. The time of the reset could be shifted by preemptively reconnecting at a desired time, they only reset the link after 24h of actual uptime.