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Re: Strange Network Problem

On 08/31/2018 10:41 PM, David Christensen wrote:
On 08/31/2018 12:50 PM, Stephen P. Molnar wrote:
I am running Debian Stretch on my Linux platform.

I have noticed low internet traffic when I have not been doing anything outside of my LAN. This has made me a tad suspicious.


root@AbNormal:/home/comp# ifconfig
enp2s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
inet netmask broadcast
         ether bc:ee:7b:5e:83:36  txqueuelen 1000  (Ethernet)
         RX packets 796401  bytes 529829454 (505.2 MiB)
         RX errors 0  dropped 0  overruns 0  frame 0
         TX packets 236054  bytes 22520861 (21.4 MiB)
         TX errors 0  dropped 0 overruns 0  carrier 0 collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
         inet  netmask
         loop  txqueuelen 1  (Local Loopback)
         RX packets 399  bytes 42360 (41.3 KiB)
         RX errors 0  dropped 0  overruns 0  frame 0
         TX packets 399  bytes 42360 (41.3 KiB)
         TX errors 0  dropped 0 overruns 0  carrier 0 collisions 0

It turns out that this ISP, is my ISP, AT&T here in Columbus, Ohio.

The other four nodes on my LAn all have IP's starting with 192.168.1 - which is what it's supposed to be.

Just what is going on here? I don't have a clue.

I dop have firewalls implemented on both the modem and the computers.

Any insights will be much appreciated.

Thanks in advance.

Running nslookup(1):

    2018-08-31 18:53:21 dpchrist@vstretch ~
    $ nslookup

    Non-authoritative answer: name = 162-237-98-238.lightspeed.clmboh.sbcglobal.net.

    Authoritative answers can be found from:

Running host(1):

    2018-08-31 18:58:15 dpchrist@vstretch ~
    $ host domain name pointer 162-237-98-238.lightspeed.clmboh.sbcglobal.net. appears to be a valid IPv4 public Internet address.

You should have a device provided by your Internet service provider (ISP) between their wiring (e.g. telephone service) and your wiring (e.g. Ethernet local area network/LAN). What is the make and model of the ISP device? Please provide a URL to the product support page.

What are the "other four nodes"?

How is everything interconnected?


Thanks for your reply.

ISO device is an Arris BGE210-700 Broadband Gateway Release 1.0 from AT&T (http://www.arris.com/Search/?q=Arris+BGE210-700+Broadband+Gateway)

Wired Connections:  2 Desktops,  printer and VOIP telephone

Wireless Connections:  Laptop and two Android Smartphones

root@AbNormal:/home/comp# nslookup
> nslookup -a

Non-authoritative answer:
Name:    nslookup
Name:    nslookup
> host

Non-authoritative answer:
*** Can't find host: No answer

Stephen P. Molnar, Ph.D.
(614)312-7528 (c)
Skype: smolnar1