Random DNS issues?

Related to Modems, Hotspots, Dongles ONLY
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backdrop-scrounger
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Random DNS issues?

Post by backdrop-scrounger » Mon May 10, 2021 7:49 pm

I've been using a GL.iNet AR750s as a travel router for about 8 months now, doing USB tether from a phone plugged into it.

I tried Visible (terrible speeds where I was. Like dial-up bad). I moved to a 100GB Cricket data-only plan, which was great, but I would run out of data every month so it was kinda crappy. I did a 100GB T-Mobile data-only plan, and it was pretty meh. Speeds weren't great, but what I've finally settled on was an Unlimited Cricket plan (the $60/month) one and changing the TTL.

I just setup a custom firewall rule to do this:

Code: Select all

iptables -t mangle -I POSTROUTING -o usb0 -j TTL --ttl-set 65
This has gotten me the best speeds and no data caps (I use about 125GB-180GB month), but I have some really random issues with it. It seems like the more devices are using the WiFi from the router, the more issues I have. The biggest issue is that randomly sites will just fail to load because the DNS couldn't resolve. It's totally random and refreshing about 10-20 times will eventually make it work. It never happened on any of my other plans, so I'm wondering if it's an issue of the TTL being modified or something? Do I need to play with MTU as well?

MattB29
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Re: Random DNS issues?

Post by MattB29 » Tue May 11, 2021 6:23 am

I am on Cricket data only plan (20gb/mo) and will occasionally notice that some sites refuse to load or stall out loading. This can be corrected by doing a modem restart. I do not use wifi so it is just one device via ethernet at a time. I just chalk it up to the fact my LTE connection strength is at the edge of usable. I am just happy to have a faster intenet option at my location than the one using the telephone line which also was not terribly reliable.

BTW: Cricket now has the 100gb plan for $55/mo versus the previous $90.

backdrop-scrounger
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Re: Random DNS issues?

Post by backdrop-scrounger » Thu May 13, 2021 10:53 am

For whatever reason if I connect to my Wireguard VPN from my server at home or my work VPN, the issue disappears. So I'm not sure why that is.

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Didneywhorl
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Re: Random DNS issues?

Post by Didneywhorl » Fri May 14, 2021 3:37 pm

Sounds like the carrier is doing something goofy with their proxies, if you're avoiding the issue with a VPN.

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