RELENG_7: something is very wrong with UDP?

Jeremy Chadwick koitsu at
Thu Sep 18 19:18:24 UTC 2008

On Thu, Sep 18, 2008 at 06:05:43PM +0300, Oleg V. Nauman wrote:
> c) traceroute prints 0.00 like response time for every host

Interesting, since traceroute bases the RTT on the amount of time it
takes between the initial packet sent (see below) and the time it
receives the ICMP port unreachable response.  Yes, I am fully aware
traceroute uses UDP as the default protocol to induce said ICMP.

That said, does the erroneous behaviour go away when using -P tcp?

| Jeremy Chadwick                                jdc at |
| Parodius Networking              |
| UNIX Systems Administrator                  Mountain View, CA, USA |
| Making life hard for others since 1977.              PGP: 4BD6C0CB |

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