strange ping behaviour

[RJ45]

if I ping from my FreeBSD 5.2.1 box to my adsl gatwway (OpenBSD 3.3)

I got normal results:
ping juno.hidden.org
64 bytes from 172.16.16.254: icmp_seq=0 ttl=255 time=0.232 ms
64 bytes from 172.16.16.254: icmp_seq=1 ttl=255 time=0.203 ms
64 bytes from 172.16.16.254: icmp_seq=2 ttl=255 time=0.184 ms
64 bytes from 172.16.16.254: icmp_seq=3 ttl=255 time=0.186 ms
64 bytes from 172.16.16.254: icmp_seq=4 ttl=255 time=0.186 ms


if I use traceroute:

traceroute to juno.hidden.org (172.16.16.254), 64 hops max, 52 byte
packets
 1  juno (172.16.16.254)  437.349 ms  -436.602 ms  0.438 ms

how this can be ?
the RTT looks complitely scrwed

is it a tracerotue issue of FreeBSD?
tracerouting from other hosts I do not have this problem.

thanks

Rick