Re: Telnet over WAN latency troubleshooting

JF,
so far no bottleneck has shown up in traceroutes, but again I can
only run them (usefully) from the central site. The DSL router and
DECserver don't provide statistics, only the addresses for pings and
traceroutes (but I'm getting signed on to one of the remote DSL modems
again to recheck rather than trusting the docs).

We're currently using large packets mostly to exercise the line;
using default size packets (64 bytes I believe) generally shows the
same level of packet loss though. We also tested large to make sure
that the PPPoE underpinnings weren't causing large packet loss; that
was the reason for reducing the firewall MTUs from 1500.

Interestingly (sadly) the DNAS documentation doesn't have much
useful in it beyond setting a keepalive timer, and number of retries.
The online help, however, lists options for TCP delay ack and serial
delay; the explanation of the latter is a bit sparse, but I'm going to
take a stab at changing those too, with users standing by to check.
Given Rick Jone's excellent explanations above I doubt it will make a
difference, but its worth a shot. FWIW, the servers came with the
following settings:

TCP Keepalive timer: Disabled
TCP Keepalive Retry: 8
TCP Delayed Acks: Enabled
TCP Serial Delay: Enabled

Rich
CCS

.