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Re: Strange Network Problem

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On 09/01/2018 04:05 AM, Stephen P. Molnar wrote:
> 
> 
> 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.
>>>
>>> Now:
>>>
>>> root@AbNormal:/home/comp# ifconfig
>>> enp2s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
>>>          inet 162.237.98.238  netmask 255.255.252.0  broadcast 
>>> 162.237.99.255
>>>          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 127.0.0.1  netmask 255.0.0.0
>>>          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, 162.237.98.238 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 162.237.98.238
>>     Server:        192.168.5.1
>>     Address:    192.168.5.1#53
>>
>>     Non-authoritative answer:
>>     238.98.237.162.in-addr.arpa    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 162.237.98.238
>>     238.98.237.162.in-addr.arpa domain name pointer 
>> 162-237-98-238.lightspeed.clmboh.sbcglobal.net.
>>
>>
>> 162.237.98.238 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?
>>
>>
>> David
>>
>>
> 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
> Server:        192.168.1.254
> Address:    192.168.1.254#53
> 
> Non-authoritative answer:
> Name:    nslookup
> Address: 198.105.244.130
> Name:    nslookup
> Address: 104.239.207.44
>  >
>  > host
> Server:        192.168.1.254
> Address:    192.168.1.254#53
> 
> Non-authoritative answer:
> *** Can't find host: No answer
>  >
> 

It appears that your ISP gateway device is configured to pass through 
it's Internet address (and all incoming packets) to the computer in 
question.  This is a feature that allows a server behind the gateway to 
be visible on the Internet.


Enabling or disabling gateway features is a matter of browsing to the 
gateway's IP address (192.168.1.254?) and operatingthe web control panel.


I have a Pace Plc Model 5268AC, also through AT&T.  The relevant control 
panel page for putting a server on the Internet would seem to be 
Settings -> Firewall -> Applications, Pinholes and DMZ.  I would pick a 
computer and then select "Allow all applications (DMZplus mode)" to turn 
the feature on.  The feature is currently off, so I don't know how I 
would turn it off.


If you can't figure out the control panel for your gateway, contact your 
ISP.


David

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Thread

Strange Network Problem "Stephen P. Molnar" <s.molnar@sbcglobal.net> - 2018-08-31 22:00 +0200
  Re: Strange Network Problem Dan Purgert <dan@djph.net> - 2018-08-31 23:40 +0200
  Re: Strange Network Problem David Christensen <dpchrist@holgerdanske.com> - 2018-09-01 04:50 +0200
    Re: Strange Network Problem "Stephen P. Molnar" <s.molnar@sbcglobal.net> - 2018-09-01 13:10 +0200
      Re: Strange Network Problem rhkramer@gmail.com - 2018-09-01 14:30 +0200
        Re: Strange Network Problem "Stephen P. Molnar" <s.molnar@sbcglobal.net> - 2018-09-01 18:10 +0200
          Re: Strange Network Problem rhkramer@gmail.com - 2018-09-01 20:00 +0200
      Re: Strange Network Problem David Christensen <dpchrist@holgerdanske.com> - 2018-09-02 07:40 +0200
        Re: Strange Network Problem "Stephen P. Molnar" <s.molnar@sbcglobal.net> - 2018-09-02 14:20 +0200
          Re: Strange Network Problem mick crane <mick.crane@gmail.com> - 2018-09-02 14:50 +0200
            Re: Strange Network Problem David Christensen <dpchrist@holgerdanske.com> - 2018-09-02 20:40 +0200
              Re: Strange Network Problem mick crane <mick.crane@gmail.com> - 2018-09-03 00:30 +0200
                Re: Strange Network Problem David Christensen <dpchrist@holgerdanske.com> - 2018-09-03 05:20 +0200
  Re: Strange Network Problem mick crane <mick.crane@gmail.com> - 2018-09-01 10:10 +0200

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