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Re: GTEI Filtering ICMP Echo/Echo Replies?

  • From: Jesper Skriver
  • Date: Fri Dec 31 12:40:03 1999

On Fri, Dec 31, 1999 at 12:14:20PM -0500, Martin, Christian wrote:
> 
> Happy Y2K to all!  Looks as if GTEI has begun filtering ICMP type 0 and 8 (I
> hope that's all) through their backbone.  I heard that this was because of
> DoS threats, but I haven't seen any other commentary on the subject.  GTEIs
> NOC claims that they have made no changes.  From some places I can get
> through the network, but others fail.  CERFNet and others are clean.
> Traceroute works fine everywhere.  Has anyone else seen anything similar?

Seems normal in their backbone from NYC to PaloAlto

jesper@freesbee$ trace www.cisco.com
traceroute to www.cisco.com (198.133.219.25), 30 hops max, 40 byte packets
 1  eth9-0-0.sltnxt2.ip.tele.dk (193.162.159.76)  0.781 ms  0.572 ms 0.661 ms
 2  atm0-0-0-72.60M.kd4nxi2.ip.tele.dk (195.249.7.89)  5.612 ms  5.485 ms  5.499 ms
 3  atm0-0-0-76.60M.boanxt1.ip.tele.dk (195.249.7.106)  9.155 ms  8.939 ms  8.821 ms
 4  feth4-0-0.100M.boanxi2.ip.tele.dk (195.249.5.202)  9.310 ms  9.295 ms  9.033 ms
 5  pos1-0-0.155M.NewYorknxi2.ip.tele.dk (195.249.5.190)  87.537 ms 87.780 ms  87.641 ms
 6  s4-0-1.nyc4-cr5.bbnplanet.net (4.1.78.5)  88.158 ms  88.162 ms 88.538 ms
 7  p5-1.nyc4-nbr2.bbnplanet.net (4.0.3.158)  87.972 ms  88.012 ms 88.212 ms
 8  p5-0.nycmny1-br1.bbnplanet.net (4.0.5.97)  88.870 ms  88.256 ms 88.378 ms
 9  p4-0.nycmny1-br2.bbnplanet.net (4.24.6.226)  88.517 ms  88.075 ms 88.443 ms
10  p4-0.sanjose1-nbr2.bbnplanet.net (4.24.7.58)  149.304 ms  149.474 ms 149.642 ms
11  p1-0.sanjose1-nbr1.bbnplanet.net (4.0.5.85)  149.730 ms  150.000 ms 149.484 ms
12  p4-0.paloalto-nbr2.bbnplanet.net (4.0.1.1)  151.274 ms  150.704 ms 150.563 ms
13  p0-0-0.paloalto-cr18.bbnplanet.net (4.0.3.86)  151.082 ms  150.598 ms  153.603 ms
14  h1-0.cisco.bbnplanet.net (4.1.142.238)  149.434 ms  149.397 ms 149.661 ms
15  pigpen.cisco.com (192.31.7.9)  150.003 ms  149.898 ms  149.611 ms
16  www.cisco.com (198.133.219.25)  149.750 ms  149.862 ms  149.408 ms
jesper@freesbee$ ping www.cisco.com
PING www.cisco.com (198.133.219.25): 56 data bytes
64 bytes from 198.133.219.25: icmp_seq=0 ttl=226 time=150.271 ms
64 bytes from 198.133.219.25: icmp_seq=1 ttl=226 time=150.445 ms
64 bytes from 198.133.219.25: icmp_seq=2 ttl=226 time=149.324 ms

/Jesper

-- 
Jesper Skriver, jesper(at)skriver(dot)dk
Work:    Network manager @ AS3292 (Tele Danmark DataNetworks)
Private: Geek            @ AS2109 (A much smaller network ;-)

One Unix to rule them all, One Resolver to find them,
One IP to bring them all and in the zone to bind them.





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