Re: network mystery!!??

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On 26/03/2022 10:29, Jack Craig wrote:



i have a networking mystery ; i hope someone might give me a clue.

i am working to restore a web server to internet access that is failing after att update
the att older modem (pace 5238ac) with arris BGW210-700.

i have a static ip from att in the range 108.220.213.0/255.255.255.248 <http://108.220.213.0/255.255.255.248>, 108.220.213.121 is the external ip for the server.

the bgw210-700 is the primary router/modem and is connected to a 3rd party router, netgear nighthawk,

the internal 10.0.0.0/ <http://10.0.0.0/>  connects to the netgear nighthawk

ATT's broadband configuration is

 Blackhole-ATT (wireless name)

   Broadband connection source      DSL
   Broadband connection             up
   Broadband network type           lightspeed
   Broadband ipv4 address           108.90.204.76
   Broadband gateway address        108.90.204.1


outbound packets from the server (WS), are routed from the 10.0.0.1 nighthawk to the ATT router to the internet.

the 108.90.204.0 network routing from the att router to the att's gateway. .76 is the router, .1 is the GW.

sample route, ...

10.0.0.101 ws.linuxlighthouse.com <http://ws.linuxlighthouse.com> (internal IP) 2 packets transmitted, 2 received, 0% packet loss, time 1033ms
10.0.0.1                           Blackhole-NH           2 packets transmitted, 2 received, 0% packet loss, time 1018ms
192.168.1.254                 Blackhole-ATT      2 packets transmitted, 2 received, 0% packet loss, time 1001ms
108.90.204.76             att subnet (local router)  2 packets transmitted, 2 received, 0% packet loss, time 1002ms
108.90.204.1            att subnet (remote GW)               2 packets transmitted, 2 received, 0% packet loss, time 1001ms
108.220.213.121 ws.linuxlighthouse.com <http://ws.linuxlighthouse.com> (public IP) 2 packets transmitted, 2 received, 0% packet loss, time 1001ms
108.220.213.126   linuxlighthouse (public GW)          2 packets transmitted, 2 received, 0% packet loss, time 1001ms

Sounds like 108.90.204.76 is missing routes. I'm assuming that 108.220.213.121 previously answered pings
and originally was the final destination of an external traceroute.

[egreshko@meimei ~]$ traceroute 108.220.213.121
traceroute to 108.220.213.121 (108.220.213.121), 30 hops max, 60 byte packets
 1  _gateway (192.168.1.1)  0.434 ms  0.728 ms  0.681 ms
 2  * * *
 3  tpdt-3308.hinet.net (168.95.82.198)  23.574 ms  23.530 ms 23.451 ms
 4  tpdb-3031.hinet.net (220.128.1.102)  7.827 ms 220-128-1-50.hinet-ip.hinet.net (220.128.1.50)  7.210 ms tpdt-3032.hinet.net (220.128.27.94)  7.386 ms
 5  r4102-s2.tp.hinet.net (220.128.7.69)  7.123 ms r4102-s2.tp.hinet.net (220.128.14.93)  7.296 ms r4102-s2.tp.hinet.net (220.128.13.93)  7.252 ms
 6  r4002-s2.tp.hinet.net (220.128.6.85)  7.538 ms r4002-s2.tp.hinet.net (220.128.6.81)  6.710 ms  6.656 ms
 7  pa-r32.us.hinet.net (202.39.91.29)  133.962 ms  132.083 ms 132.075 ms
 8  32.141.85.13 (32.141.85.13)  133.458 ms  133.358 ms  133.297 ms
 9  12.123.242.38 (12.123.242.38)  138.066 ms  137.303 ms  139.959 ms
10  12.122.149.225 (12.122.149.225)  143.022 ms  137.567 ms  137.573 ms
11  12.122.158.25 (12.122.158.25)  138.446 ms  137.435 ms  138.346 ms
12  * * *
13  99.134.39.24 (99.134.39.24)  136.686 ms  136.506 ms *
14  99.134.39.11 (99.134.39.11)  136.191 ms  136.211 ms  136.066 ms
15  99.161.44.77 (99.161.44.77)  137.461 ms  137.438 ms  138.025 ms
16  108-90-204-76.lightspeed.mtryca.sbcglobal.net (108.90.204.76) 157.627 ms  157.580 ms  157.980 ms
17  * * *
18  * * *
19  * * *
20  * * *
21  * * *
22  * * *
23  * * *
24  * * *
25  * * *
26  * * *
27  * * *
28  * * *
29  * * *
30  * * *

Remember if a server that should be visible externally, but isn't. Then outbound requests/replies will also fail.

--
Did 황준호 die?
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