Traceroute Hop Count?

Rudifn2007 · 12-05-2015, 06:43 AM

I'm a bit confused about how many hops this shows ...

[root@host-2-129 ~]# traceroute -I 10.200.0.1

traceroute to 10.200.0.1 (10.200.0.1), 30 hops max, 60 byte packets
1 host-2-134.linuxzoo.net (10.0.2.134) 0.218 ms 0.195 ms 0.151 ms
2 hub1-gw.linuxzoo.net (10.200.0.1) 0.562 ms 0.418 ms 0.479 ms
[root@host-2-129 ~]#

I thought it was 2?

I am doing a tutorial on Linuxzoo, asking how many hops does it take to get to the last network node which is 10.200.0.1.

jpollard · 12-05-2015, 07:40 AM

Looks like two for that particular path. host-2-134 is connected to both systems (host-2-129, and hub1-gw).

It depends on your network - your network mask is not the default for the 10. net (which would be 255.0.0.0), which would eliminate the hop. But that depends on your networks physical topology. Physical (or logical) partitioning of the net would add hops.

chrism01 · 12-07-2015, 06:21 PM

The msg '30 hops max' means it will only send up to 30 hops away ie any system further away will be deemed 'unreachable'.
This num is configurable - see the man page and https://en.wikipedia.org/wiki/Traceroute

JJJCR · 12-08-2015, 03:12 AM

I think its 2 hops, but it would be better to do a traceroute like 8.8.8.8

traceroute -I 8.8.8.8 you will be able to see quite a few hops.

check out link below it might help:
http://kb.netgear.com/app/answers/de...ere-are-to-the

jpollard · 12-08-2015, 03:25 AM

Quote:

Originally Posted by JJJCR

I think its 2 hops, but it would be better to do a traceroute like 8.8.8.8

traceroute -I 8.8.8.8 you will be able to see quite a few hops.

check out link below it might help:
http://kb.netgear.com/app/answers/de...ere-are-to-the

That depends on the ISP. A number of them are no longer passing ICMP - used by default to count hops. These show up as "* * *" entries.

JJJCR · 12-08-2015, 07:05 PM

Quote:

Originally Posted by jpollard

That depends on the ISP. A number of them are no longer passing ICMP - used by default to count hops. These show up as "* * *" entries.

yup, I understand some routers may not respond to ICMP due to security issues. Thanks for the heads up.

chrism01 · 12-08-2015, 08:26 PM

In those cases, try http://linux.die.net/man/1/tcptraceroute