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Linux - Networking This forum is for any issue related to networks or networking.
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Old 01-03-2016, 04:25 PM   #1
UrbenLegend
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Home server connections failing from Comcast to Verizon networks


I've spent the better part of the holiday break trying to debug an issue with my home server and I am hoping some of you guys can help me out. It is quite confusing but I'll try to put it as succinctly as possible.

First, here's what the server is running:
Software: Fedora 23 server running Apache for my blog and owncloud, Plex, Mumble, SSH
ISP: Comcast
Location: South Bay, Northern California

Basically I can't establish a stable connection to my server from any machine on a Verizon network (except mobile). I've asked other friends who also have Verizon and they are unable to connect as well. I've done some investigation using Wireshark and here's what I found:
  1. Verizon Client -> Server: data flows fine
  2. Server -> Verizon Client: sending a few bytes is fine
  3. Server -> Verizon Client: send a lot of data, connection becomes completely unresponsive. Server attempts to send out packets, but client does not receive them.

As you can see, the fact that the server can't send any meaningful amount of data to the clients means that no webpages or media are served, and the clients time out. Here's where things get interesting:
  1. People who are not on Verizon for their home internet can connect just fine.
  2. People who are on mobile connections (including Verizon Mobile) can connect just fine.
  3. If I am running Windows and connected to Ethernet, I can connect just fine, even though I am currently at my parent's house on a Verizon Network. If I am on Windows and connected via WiFi, it doesn't work. If I am on Linux, neither Ethernet or WiFi works. I do have a friend who has Verizon and he says Ethernet does NOT work for him on Windows.

The last point really pisses me off because otherwise I would just chuck it to something wrong with connections between Comcast and Verizon, but the fact that it works via Windows WiFi really baffles the crap out of me.

So how do I fix this? If its on the ISP side, who do I blame? Comcast or Verizon?

P.S. I should note that at the beginning of the holiday break, it was working, but gradually slowed down and then stopped working entirely.

Last edited by UrbenLegend; 01-03-2016 at 04:29 PM.
 
Old 01-03-2016, 08:24 PM   #2
John VV
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first Fedora is normally a VERY BAD choice for a server
it's 13 MONTH!!!! lifespan is a very big problem

CentOS 7 has a 7 YEAR lifespan and is a better choice

next is Comcast !!!!!!
unless this IS!!! a BUSINESS connection it is a VIOLATION of the Comcast user agreement to run a home server
( Comcast sent me a legal NASTY GRAM a few years back )


also Comcast uses there own DNS
YOU have to have the server use Google( 8.8.8.8 , 8.8.4.4 ) or OpenDNS

and it is a ROTATING ip address -- it might stay constant for 6 months OR it might change 6 times in one day

So the use of a dns redirect is likely needed ( No-ip.com is one i have used in the past )


Are you using ipv4 or 6 ?
last i checked Comcast was royally messing up the ipv6 addresses
 
Old 01-04-2016, 02:59 AM   #3
UrbenLegend
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Quote:
Originally Posted by John VV View Post
first Fedora is normally a VERY BAD choice for a server
it's 13 MONTH!!!! lifespan is a very big problem
Haha I am well aware. This isn't for hosting anything serious or in production. It really is just for personal use. Some down time to maintain the server is okay and to be honest the latest Fedora releases are quite stable for server usage.

Quote:
Originally Posted by John VV View Post
also Comcast uses there own DNS
YOU have to have the server use Google( 8.8.8.8 , 8.8.4.4 ) or OpenDNS
Why would it need to use Google or OpenDNS if all its doing is just accepting connections and sending back data?


Quote:
Originally Posted by John VV View Post
and it is a ROTATING ip address -- it might stay constant for 6 months OR it might change 6 times in one day

So the use of a dns redirect is likely needed ( No-ip.com is one i have used in the past )


Are you using ipv4 or 6 ?
last i checked Comcast was royally messing up the ipv6 addresses
It's IPv4. Yes, I was thinking of setting up a dynamic DNS client on my server, but the IPv4 address doesn't change often enough for me to bother with it. I disabled IPv6 because it changed too much. I'll eventually get around to setting it up.

I am currently in talks with Verizon about their network issues. Things seem to have cleared up for now, but I'll keep an eye on it.
 
Old 01-04-2016, 06:04 AM   #4
jag2000
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If you do a ping or trace route to your home from another connection where does it die? Sounds to me like routing or a BGP issue if you cannot reach from elsewhere. Also do you have any firewall rules that may be blocking up address space on your Fedora box ?
 
Old 01-04-2016, 02:33 PM   #5
UrbenLegend
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Ping was fine. But traceroute didn't show anything around hop 5. It seems to be working okay now though, but I am testing it by VPN'ing into my router right now. Not sure if that makes a difference.

My firewall rules have ports 80, 443, and 32400 (Plex) open. If it was because of firewall rules, everyone wouldn't be able to access it though, not just Verizon customers.
 
  


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