\Documents and Settings\zee>tracert http://www.yahoo.com
acing route to www-real.wa1.b.yahoo.com [188.8.131.52]
er a maximum of 30 hops:
1 2 ms 2 ms 1 ms 192.168.0.1
2 11 ms * 9 ms 67-61-144-1.cpe.cableone.net [184.108.40.206]
3 10 ms 10 ms 10 ms 192.168.41.33
4 11 ms 11 ms 11 ms phx-edge-11.inet.qwest.net [220.127.116.11]
5 13 ms 11 ms 24 ms phx-core-01.inet.qwest.net [18.104.22.168]
6 23 ms 23 ms 23 ms lap-brdr-03.inet.qwest.net [22.214.171.124]
7 26 ms 35 ms 35 ms if-12-1.icore1.EQL-LosAngeles.as6453.net [206
8 40 ms 36 ms 34 ms Vlan1114.icore1.PDI-PaloAlto.as6453.net [209.
9 32 ms 33 ms 32 ms if-6-0-0-1144.mcore3.PDI-PaloAlto.as6453.net
0 34 ms 34 ms 33 ms ix-11-0-4.mcore3.PDI-PaloAlto.as6453.net [64.
1 33 ms 36 ms 176 ms ae0-p151.msr2.sp1.yahoo.com [126.96.36.199]
2 34 ms 35 ms 32 ms te-8-1.bas-a1.sp1.yahoo.com [188.8.131.52]
3 35 ms 35 ms 35 ms f1.www.vip.sp1.yahoo.com [184.108.40.206]
Based on above output, can i deduce the following:
1) yahoo.com is using the isp"aloAlto.as6453.net" ?
2 is my isp cableone.net peering with qwest.net which is peering with Losangeles.net which is peering with Paloalto.net which is finally peering with yahoo.com?
3) When we use the word" peering" as above do we mean running bgp. For example, abc.com is peering with cde.net, does it mean abc is running bgp with cde.net?
thanks a lot!
Just by looking at these values, we can not be sure how long it take icmp packet to get to destination and return to the source.It might be possible the receiving node is heavily loaded and thus take longer to process the packet and sends the reply back to sender.
Am i correct?
Amazing Sarah, I couldn't have said it better myself :)
Edison correctly notes peering is between BGP neighbors, but that often is unrelated to your question about DNS domains, i.e. abc.net and abc.com.
On the Internet, peering is often thought of as the relationship between BGP routers of different ASs (autonomous systems).
If you researched what AS owned each tracert hop, you would be able to determine the AS peering locations. It's very likely there are multi-hops within some ASs.
Only one organization would "own" each AS, but many, many DNS domains might reside there, e.g., single organization that owns multiple DNS domains and/or single organization that hosts many DNS domains.
Yes, the peering concept is used when you establish a neighbor connection between BGP speaking routers.
The 3 values from traceroute indicates the latency from the source to that specific hop. Traceroute sends 3 packets and the 3 values represent the latency on each of the packets.
BGP is the de facto standard for dynamic routing protocol in the internet. Since your traceroute is illustrating internet routes the next-hop reachability between providers is done via BGP.
With that said, yahoo.com may be using 'PaloAlto' to reach your network because it may be the best path based on BGP attribute but it does not imply that yahoo.com only peers with that device.
As you can see from my traceroute:
>>>eliminating some cisco internal hops<<<
13 31 ms 32 ms 30 ms 220.127.116.11
14 41 ms 42 ms 41 ms cr2.rlgnc.ip.att.net [18.104.22.168]
15 40 ms 39 ms 39 ms cr1.wswdc.ip.att.net [22.214.171.124]
16 42 ms 39 ms 37 ms 126.96.36.199
17 40 ms 51 ms 39 ms 188.8.131.52
18 41 ms 41 ms 39 ms ae1-p160.msr1.re1.yahoo.com [184.108.40.206]
19 47 ms 42 ms 42 ms te-9-4.bas-a2.re1.yahoo.com [220.127.116.11]
20 40 ms 39 ms 39 ms f1.www.vip.re1.yahoo.com [18.104.22.168]
I'm not using PaloAlto, so Yahoo is peering with a backbone router that has all internet routes and based on the source of the traffic it uses one path over another relying on BGP Best path selection. The same can be said for my ISP when going towards yahoo.com