Re: Level3 4.2.2.1 and 4.2.2.2 not responding to pings, DNS queries work

[Tim Burke <tim () mid net>]

no issues here in Houston on gpon from 397412.

3356 has been doing an insane amount of icmp and traceroute filtering on their routers as of late, but the resolver IPs 
continue to respond with no issues.

Based on RTT I assume I am going up to Dallas... may be an issue with the resolvers that are local to you.

tim@tb-m3mbp ~ $ ping -c3 4.2.2.1
PING 4.2.2.1 (4.2.2.1) 56(84) bytes of data.
64 bytes from 4.2.2.1: icmp_seq=1 ttl=57 time=6.71 ms
64 bytes from 4.2.2.1: icmp_seq=2 ttl=57 time=6.76 ms
64 bytes from 4.2.2.1: icmp_seq=3 ttl=57 time=6.77 ms

--- 4.2.2.1 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2003ms
rtt min/avg/max/mdev = 6.713/6.746/6.772/0.024 ms
tim@tb-m3mbp ~ $ ping -c3 4.2.2.2
PING 4.2.2.2 (4.2.2.2) 56(84) bytes of data.
64 bytes from 4.2.2.2: icmp_seq=1 ttl=57 time=9.01 ms
64 bytes from 4.2.2.2: icmp_seq=2 ttl=57 time=6.82 ms
64 bytes from 4.2.2.2: icmp_seq=3 ttl=57 time=6.78 ms

--- 4.2.2.2 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2003ms
rtt min/avg/max/mdev = 6.778/7.536/9.008/1.040 ms
tim@tb-m3mbp ~ $ traceroute 4.2.2.1
traceroute to 4.2.2.1 (4.2.2.1), 30 hops max, 60 byte packets
 1  172.29.0.126 (172.29.0.126) [*]  0.127 ms  0.109 ms  0.096 ms
 2  136-244-3-1.static.tachusfiber.net (136.244.3.1) [AS397412]  3.401 ms  3.394 ms  3.284 ms
 3  hu0-0-0-23.r02.conroe.tx.tachusfiber.net (136.244.1.178) [AS397412]  3.259 ms  3.263 ms  3.285 ms
 4  * * *
 5  fh0-0-2-0.er01.houston.tx.tachusfiber.net (136.244.1.26) [AS397412]  4.662 ms * *
 6  64.154.27.21 (64.154.27.21) [AS3356]  8.422 ms  5.449 ms 8-2-4.bear2.houston1.level3.net (4.2.239.93) [AS3356]  
4.997 ms
 7  * * *
 8  * * *

________________________________
From: NANOG <nanog-bounces+tim=mid.net () nanog org> on behalf of Mel Beckman <mel () beckman org>
Sent: Sunday, January 12, 2025 6:24 PM
To: Jerry Cloe <jerry () jtcloe net>
Cc: nanog () nanog org <nanog () nanog org>
Subject: Re: Level3 4.2.2.1 and 4.2.2.2 not responding to pings, DNS queries work

Still not pinging from Frontier, Lumen, AT&T, or Verizon networks


 -mel

On Jan 12, 2025, at 4:13 PM, Jerry Cloe <jerry () jtcloe net> wrote:


O:\>ping 4.2.2.1

Pinging 4.2.2.1 with 32 bytes of data:
Reply from 4.2.2.1: bytes=32 time=36ms TTL=56
Reply from 4.2.2.1: bytes=32 time=44ms TTL=56
Reply from 4.2.2.1: bytes=32 time=36ms TTL=56
Reply from 4.2.2.1: bytes=32 time=38ms TTL=56

Ping statistics for 4.2.2.1:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 36ms, Maximum = 44ms, Average = 38ms

Same for 4.2.2.2



-----Original message-----
From: Mel Beckman <mel () beckman org>
Sent: Sun 01-12-2025 06:07 pm
Subject: Level3 4.2.2.1 and 4.2.2.2 not responding to pings, DNS queries work
To: nanog () nanog org;
I noticed that Level3 open DNS 4.2.2.1 and 4.2.2.2 stopped responding to ping today. They are responding to DNS queries 
however.

Does anyone know if this filtering is going to be permanent?

-mel beckman