[Discuss] [EXT] Problem accessing blu.org

[Jerry Feldman]

I'll try the tcpdump shortly. I can log into the server through my wireless
provider
Also note that if I ping the ip address, I get the same results.

--
Jerry Feldman <gaf.linux at gmail.com>
Boston Linux and Unix http://www.blu.org
PGP key id: 6F6BB6E7
PGP Key fingerprint: 0EDC 2FF5 53A6 8EED 84D1  3050 5715 B88D 6F6
B B6E7

On Tue, May 19, 2020, 9:42 AM Chuck Anderson <cra at wpi.edu> wrote:

> On Tue, May 19, 2020 at 09:01:12AM -0400, Jerry Feldman wrote:
> > I have Xfinity internet at home. In the past few weeks I can't access
> > blu.org. Ping and website times out from phone over wifi and desktop
> fedora
> > 32 connected by cable to the gateway. If I turn wifo off on my phone I am
> > able to ping, sdh, and get web site from my wireless carrier. It seems to
> > be related to my Wan address since other Comcast users can access Blu.
> John
> > and I have checked our server and nothing appears to be blocking my Wan
> > address. One interacting anomaly is that when I reset the gateway I am
> able
> > to access the site for a short period of time, such as 10 mins. I've been
> > on chats and phone calls with Xfinity, but they can't find any issues. I
> am
> > able to access all other web sites and can ping other hosts. It is only
> > blu.org that is the problem.
> >
> > Since it appears to only be my home that is affected, I don't think
> Comcast
> > is blacklisting Blu. I don't have any evidence that the BLU server is
> > blocking my ip address.
> >
> > Looking for ideas
>
> Since it is possible to coordinte both ends in this instance, can you
> try running tcpdump or wireshark on your end, while someone runs
> tcpdump on the blu.org server, and see where the conversation is being
> lost or getting stuck?  Use the IP of blu.org and your router's public
> IP to filter the tcpdumps like this (substitute the correct names of
> the network intefaces):
>
> client> sudo tcpdump -i <interface> -nnn -s0 -vvv -w clientside.pcap host
> 216.235.254.230
>
> server> sudo tcpdump -i <interface> -nnn -s0 -vvv -w serverside.pcap host
> <your-router-public-ip>
>
> Then do a ping:
>
> >ping 216.235.254.230
> PING 216.235.254.230 (216.235.254.230) 56(84) bytes of data.
> 64 bytes from 216.235.254.230: icmp_seq=1 ttl=59 time=14.8 ms
> 64 bytes from 216.235.254.230: icmp_seq=2 ttl=59 time=13.2 ms
> 64 bytes from 216.235.254.230: icmp_seq=3 ttl=59 time=169 ms
> ^C
> --- 216.235.254.230 ping statistics ---
> 3 packets transmitted, 3 received, 0% packet loss, time 2003ms
> rtt min/avg/max/mdev = 13.247/65.789/169.346/73.228 ms
>
> Then do a telnet to port 80 test.  If it connects, type "HEAD / HTTP/1.0"
> and hit enter twice:
>
> >telnet 216.235.254.230 80
> Trying 216.235.254.230...
> Connected to 216.235.254.230.
> Escape character is '^]'.
> HEAD / HTTP/1.0
>
> HTTP/1.1 200 OK
> Date: Tue, 19 May 2020 13:32:54 GMT
> Server: Apache
> X-Powered-By: PHP/5.4.16
> Connection: close
> Content-Type: text/html; charset=UTF-8
>
> Connection closed by foreign host.
>
> You can send the pcaps along to the list (or me privately if you wish).
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