Just looking for some help to learn how to better troubleshoot and deal with this.
Sometimes, after a few days in, the IPv4 of my router goes down. I'm not sure this is the best phrasing to describe, so let me elaborate:
At first I didn't know what was going on, I would just think "my internet is down", because pretty much every website or service would stop working, and my go-to internet check is to ping Google DNS 126.96.36.199, which would also give me timeouts.
One time I was watching YouTube and it kept going even after everything else was down.
Oddly enough, I noticed that Google itself still worked, unlike almost every other website I knew.
Then it clicked: ping google.com -> Reply from 2800:3f0:4004:804::200e: time=33ms
I could only access websites that provided native IPv6 access, namely, very few.
This happened in my desktop, under Win10, a laptop also under Win10, and a laptop with Ubuntu.
At first I believed this was an ISP problem, somehow.
I rebooted the ADSL modem and router and everything was fine for a while.
This was a year ago, in 2016, happened twice, about two months apart.
Back then I was using a ASUS RTN13U router with LEDE, unfortunately don't remember the version.
Now, in the last four months or so, the problem came back, sometimes being really really annoying, since not even rebooting the router fixes it. Just have to keep rebooting and hope it gets in a good mood and starts working again.
Now, I'm currently using a Linksys WRT1900AC running LEDE Reboot 17.01.4 r3560-79f57e422d / LuCI lede-17.01 branch (git-17.290.79498-d3f0685).
(Was with an older release, but updated a month ago to see if it'd help solve the issue. Apparently it did and helped for a while, but last night it happened again.)
I figured this wasn't an ISP problem because I could consistently take my laptop and plug it directly into the modem and manually connect (ADSL2+) and it would work fine every time. And if I just shut it down, and plug the router again - same problem, IPv6 works, IPv4 down.
I noticed that when this happens, I can't even ping the router - configured to 192.168.1.1 - it gives me timeout.
Much less access it.
Watching anything on YouTube is fine.
Making any Google search is fine. (Good luck clicking in any result though, since 9/10 sites won't open, because ipv4)
Never had this problem before with any stock firmware, or any DD-WRT firmware on any of the 3 routers I've used in the past 6 years. In fact, no friend of mine has ever even heard of anything like this.
I'm no network expert by any means at all, but I'm a Computer Engineering grad student in my fourth year so I'm not entirely clueless either, just looking for some help, cause Googling this proved almost futile.
So... Any word of advice from anyone?
I thank you in advance for your time and consideration reading this far =)
(My apologies for any messed up wording, English isn't my primary language.)