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Router issues with icmp?
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Old 14-05-2008, 18:47   #1
isf
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Router issues with icmp?
Can't appear to traceroute out of ntl network, tcptrace is fine. Can anybody else confirm?

Code:
ping -c 20 news.bbc.co.uk
PING newswww.bbc.net.uk (212.58.226.20) 56(84) bytes of data.
64 bytes from newslb11.thdo.bbc.co.uk (212.58.226.20): icmp_seq=3 ttl=54 time=34.5 ms
64 bytes from newslb11.thdo.bbc.co.uk (212.58.226.20): icmp_seq=4 ttl=54 time=18.7 ms
64 bytes from newslb11.thdo.bbc.co.uk (212.58.226.20): icmp_seq=5 ttl=54 time=19.4 ms
64 bytes from newslb11.thdo.bbc.co.uk (212.58.226.20): icmp_seq=6 ttl=54 time=22.2 ms
64 bytes from newslb11.thdo.bbc.co.uk (212.58.226.20): icmp_seq=7 ttl=54 time=19.4 ms
64 bytes from newslb11.thdo.bbc.co.uk (212.58.226.20): icmp_seq=8 ttl=54 time=18.6 ms
64 bytes from newslb11.thdo.bbc.co.uk (212.58.226.20): icmp_seq=9 ttl=54 time=38.0 ms
64 bytes from newslb11.thdo.bbc.co.uk (212.58.226.20): icmp_seq=10 ttl=54 time=18.1 ms

--- newswww.bbc.net.uk ping statistics ---
20 packets transmitted, 8 received, 60% packet loss, time 18999ms
rtt min/avg/max/mdev = 18.120/23.644/38.020/7.441 ms
Code:
 sudo traceroute news.bbc.co.uk
traceroute to newswww.bbc.net.uk (212.58.226.33), 64 hops max, 52 byte packets
 1  x.x.x.x (x.x.x.x)  1 ms  1 ms  1 ms
 2  x.x.x.x (x.x.x.x)  9 ms  8 ms  8 ms
 3  xxxx.inet.ntl.com (x.x.x.x)  9 ms  10 ms  8 ms
 4  bagu-t3core-1b-ge-015-0.inet.ntl.com (195.182.175.45)  9 ms  11 ms  8 ms
 5  lee-bb-b-so-130-0.inet.ntl.com (80.5.161.157)  11 ms  11 ms  8 ms
 6  pop-bb-a-as1-0.inet.ntl.com (213.105.175.130)  15 ms  14 ms  16 ms
 7  * * *
 8  * * *
 9  * * *
10  * * *
Code:
sudo tcptraceroute news.bbc.co.uk
Selected device eth0, address x.x.x.x, port 55750 for outgoing packets
Tracing the path to news.bbc.co.uk (212.58.226.8) on TCP port 80 (www), 30 hops max
 1  x.x.x.x  1.015 ms  0.964 ms  1.057 ms
 2  x.x.x.x  16.195 ms  54.837 ms  25.319 ms
 3  xxxx.inet.ntl.com (x.x.x.x)  10.260 ms  11.089 ms  10.135 ms
 4  bagu-t3core-1b-ge-017-0.inet.ntl.com (195.182.179.185)  24.876 ms  18.562 ms  9.628 ms
 5  lee-bb-b-so-130-0.inet.ntl.com (80.5.161.157)  42.717 ms  22.250 ms  9.057 ms
 6  pop-bb-a-as1-0.inet.ntl.com (213.105.175.130)  23.690 ms  15.702 ms  14.206 ms
 7  pop-bb-b-ae0-0.inet.ntl.com (213.105.174.230)  15.523 ms  17.824 ms  17.392 ms
 8  tele-ic-2-as0-0.inet.ntl.com (62.253.184.6)  17.787 ms  27.678 ms  13.758 ms
 9  ntl-ge2-8.prt0.thdo.bbc.co.uk (212.58.239.217)  16.877 ms  41.377 ms  15.909 ms
10  212.58.238.129  37.555 ms  46.864 ms  17.757 ms
11  newslb14.thdo.bbc.co.uk (212.58.226.8) [open]  27.006 ms  25.185 ms  37.407 ms
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Old 14-05-2008, 19:04   #2
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Re: Router issues with icmp?
They look fine to me, the timeouts could be due to an overloaded router as ICMP packets normally get dropped if traffic volume is high
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Old 14-05-2008, 19:04   #3
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Re: Router issues with icmp?
works fine from here:

Code:
Tracing route to newswww.bbc.net.uk [212.58.226.20]
over a maximum of 30 hops:

  1    <1 ms    <1 ms    <1 ms  efw-1209668945.localdomain [192.168.200
  2     9 ms     6 ms     6 ms  10.225.80.1
  3     8 ms     7 ms     7 ms  nott-t2cam1-a-v107.inet.ntl.com [81.109

  4    11 ms     7 ms     7 ms  nott-t3core-1a-ge-013-0.inet.ntl.com [1
4.217]
  5    10 ms     9 ms    12 ms  lee-bb-a-as0-0.inet.ntl.com [213.105.17
  6    13 ms    13 ms    14 ms  pop-bb-b-as1-0.inet.ntl.com [62.253.185
  7    16 ms    14 ms    14 ms  tele-ic-2-as0-0.inet.ntl.com [62.253.18
  8    18 ms    14 ms     *     ntl-ge2-8.prt0.thdo.bbc.co.uk [212.58.2
  9    14 ms    15 ms    13 ms  212.58.238.153
 10    16 ms    14 ms    14 ms  newslb11.thdo.bbc.co.uk [212.58.226.20]
ping works on icmp echo requests, so that, and the fact my tracert works suggests that't not the problem.

ICMP does have lower prority than TCP/UDP traffic though, so the router could be dropping the ICMP packets if it's "a bit busy".
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Old 14-05-2008, 19:07   #4
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Re: Router issues with icmp?
C:\Console>tracert www.bbc.net.uk

Tracing route to www.bbc.net.uk [212.58.253.71]
over a maximum of 30 hops:

1 <1 ms <1 ms <1 ms 192.168.0.1
2 11 ms 8 ms 8 ms 10.4.xx.xx
3 7 ms 22 ms 7 ms 62.30.0.49
4 18 ms 18 ms 17 ms lee-bb-a-ge-320-0.inet.ntl.com [195.182.178.145]

5 52 ms 20 ms 17 ms pop-bb-b-as1-0.inet.ntl.com [62.253.185.238]
6 * * * Request timed out.
7 18 ms 17 ms 19 ms ntl-ge2-8.prt0.thdo.bbc.co.uk [212.58.239.217]
8 20 ms 15 ms 15 ms 212.58.238.129
9 20 ms 17 ms 17 ms te12-1.hsw0.cwwtf.bbc.co.uk [212.58.239.222]
10 25 ms 17 ms 19 ms www2.cwwtf.bbc.co.uk [212.58.253.71]

Trace complete.
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Old 14-05-2008, 19:18   #5
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Re: Router issues with icmp?
Yep all fine here in Warrington
#


Tracing route to www.bbc.net.uk [212.58.251.215]
over a maximum of 30 hops:

1 2 ms <1 ms <1 ms 192.168.0.1
2 10 ms 10 ms 14 ms 10.235.84.1
3 20 ms 6 ms 9 ms bagu-t2cam1-a-v121.inet.ntl.com [80.5.
4 26 ms 9 ms 13 ms bagu-t3core-1a-ge-017-0.inet.ntl.com
5 8 ms 10 ms 17 ms man-bb-a-so-310-0.inet.ntl.com [80.5.19.181]
6 27 ms 17 ms 14 ms gfd-bb-b-so-200-0.inet.ntl.com [62.252
7 16 ms 44 ms 16 ms redb-ic-1-as0-0.inet.ntl.com [62.253.1
8 20 ms 41 ms 29 ms 212.58.238.189
9 18 ms 17 ms 16 ms 212.58.238.133
10 17 ms 17 ms 19 ms 212.58.239.58
11 14 ms 16 ms 14 ms www8.telhc.bbc.co.uk [212.58.251.215]
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Old 14-05-2008, 20:40   #6
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Re: Router issues with icmp?
Thanks all.

The exact problem was severe SSH lag and timeouts when connecting to a specific server, I could SSH into to other machines fine. That's all working fine now, but I still can't traceroute anything outside the NTL network from home
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