Hi Alan,
Just a few thoughts.
> Below is a
> traceroute and ping to Yahoo.
> [amead@hera amead]$ traceroute www.yahoo.com
> traceroute: Warning: www.yahoo.com has multiple addresses; using
> 216.32.74.52
> traceroute to www.yahoo.akadns.net (216.32.74.52), 30 hops max, 38 byte
> packets
> 14 www3.dcx.yahoo.com (216.32.74.52) 328.424 ms 96.569 ms 127.680 ms
> [amead@hera amead]$ ping www.yahoo.com
> PING www.yahoo.akadns.net (216.32.74.50) from 64.5.73.33 : 56(84) bytes of
> data.
> 64 bytes from 216.32.74.50: icmp_seq=0 ttl=242 time=2191.2 ms
Maybe you didn't notice, these are two different servers.
> So: (1) I obviously don't fully understand traceroute; These are round
> trips between me and that node, right? So how can latencies on successive
> hops get bigger and smaller?
Yes they are round trips to the different nodes. The different latencies must
have to do with the availability of the servers. Your packets are forwarded at
full(?) speed, but latency echoing the probe depends on the server load.
Optimized for routing not for "pinging". Something like that.
> kbytes time elapsed (Kb/s)
> -------- ---------- ------- ----------
> 103360 11:51:45 10305 10.03
> 144980 13:09:23 14963 9.69
> 154340 13:26:06 15966 9.67
> 359524 21:59:00 46740 7.69
> 412700 00:20:48 55248 7.47
>
> Did I calculate the throughput correctly?
Well, if you mean KB/s, (bytes versus bits) I guess this is correct. If you
calculate the throughput from 21:59 to 00:20 your result is even worse:
(412700 - 359524)/(55248 - 46740) = 6.25 KB/s
> So in terms of modem speeds,
> this would be a sustained throughput of 60 kilo-baud?
Sorry if this sounds too picky, but that should be 60 kbps. Baud != bps.
> can I conclude that
> there is a bottleneck on my cable network or in between?
> 1 ipatrtr (64.5.73.1) 1.803 ms 1.843 ms 1.621 ms
Well, this router looks pretty busy, so I guess your LAN might have to do
with it.
> The traffic at home passed through a Linux gateway; should
> masquerading using a Celron 400 with 128 MB RAM cause a lot of
> latency? Should I be happy with these speeds?
Well, the specs should be allright. You could do this with a 486/66. You
might want to try setting the TOS flags, it seems this works for ftp (what's
scp?). See the ipchains-HOWTO for details.
I hope these comments are reassuring and of some help.
Bye,
Leonard.
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