Unable to ping certain IPs

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scronline
Posts: 28
Joined: 2005/12/31 21:09:24
Location: Bay Area, CA
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Re: Unable to ping certain IPs

Postby scronline » 2011/02/02 15:52:33

Yeah, that's what I'm thinking. I'm just at a loss as to where it might be. The only firewalls would be on the boxes themselves as there is no other firewall between the boxes and the web.

Code: Select all

[root@ns1 ~]# iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination
[root@ns1 ~]# ping centos.org
PING centos.org (72.232.194.162) 56(84) bytes of data.
64 bytes from 162.194.232.72.static.reverse.ltdomains.com (72.232.194.162): icmp_seq=0 ttl=51 time=50.0 ms
64 bytes from 162.194.232.72.static.reverse.ltdomains.com (72.232.194.162): icmp_seq=1 ttl=51 time=58.7 ms

--- centos.org ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1000ms
rtt min/avg/max/mdev = 50.048/54.417/58.787/4.375 ms, pipe 2
[root@ns1 ~]# traceroute centos.org
traceroute to centos.org (72.232.194.162), 30 hops max, 38 byte packets
 1  main (38.108.185.1)  0.576 ms  0.477 ms  0.427 ms
 2  fa0-10.na01.b001848-1.sjc05.atlas.cogentco.com (38.104.134.145)  1.091 ms  1.305 ms  1.069 ms
 3  gi3-48.3510.mpd01.sjc05.atlas.cogentco.com (66.250.12.5)  1.719 ms  1.115 ms  1.123 ms
 4  te8-4.mpd01.sjc01.atlas.cogentco.com (154.54.6.73)  1.300 ms  1.072 ms  1.121 ms
 5  te4-4.mpd01.sjc03.atlas.cogentco.com (154.54.6.238)  1.584 ms  1.565 ms  20.280 ms
 6  te-3-3.car3.SanJose1.Level3.net (4.68.110.137)  1.622 ms  1.634 ms  1.612 ms
 7  vlan99.csw4.SanJose1.Level3.net (4.68.18.254)  2.281 ms  12.283 ms  2.245 ms
 8  ae-94-94.ebr4.SanJose1.Level3.net (4.69.134.253)  8.175 ms  2.662 ms  2.755 ms
 9  ae-5-5.ebr2.SanJose5.Level3.net (4.69.148.141)  3.264 ms  3.584 ms  3.249 ms
10  ae-6-6.ebr2.LosAngeles1.Level3.net (4.69.148.201)  12.600 ms  14.057 ms  13.087 ms
11  ae-3-3.ebr3.Dallas1.Level3.net (4.69.132.78)  48.260 ms  47.832 ms  53.772 ms
12  ae-32-80.car2.Dallas1.Level3.net (4.69.145.132)  48.460 ms  48.221 ms  48.412 ms
13  DATABANK-HO.car2.Dallas1.Level3.net (4.71.170.2)  59.469 ms  49.080 ms  54.162 ms
14  10.0.0.14 (10.0.0.14)  48.937 ms  48.709 ms  54.689 ms
15  10.200.222.6 (10.200.222.6)  50.577 ms  48.609 ms  49.843 ms
16  162.194.232.72.static.reverse.ltdomains.com (72.232.194.162)  48.638 ms !<10>  48.935 ms !<10>  49.874 ms !<10>

foxb
Posts: 1921
Joined: 2006/04/20 19:03:33
Location: Montreal/QC

Re: Unable to ping certain IPs

Postby foxb » 2011/02/03 15:47:48

Then it looks OK

Try ping/traceroute with IP you have problems with?!

Maybe you IP is blocked on their side?! (I was able to ping)

For example IPS/IDS could block you automatically.

Also If I remember correctly cogentco had problems with some tier1 providers but it is unlikely to be the case.