Re: Telnet over WAN latency troubleshooting

Rich Jordan wrote:
> Pinging from the Alpha to the remote decservers (through the tunnel)
> with 1200 byte packets I see zero packet loss except for peak time

Telnet rarely sends 1200 byte packets. You can however put TELNET in
LINE MODE where there the client collects data and provides local echo
and sends a line to the remote host isntead of character by character.

This works when you have command line interface, but not when you have
character cell full screen applications.

> I still think its the ISP's problem, given the measurable packet loss
> in the afternoons, but we've already bounced off their tech support 4

When you have problems, if you do a traceroute can you see an obvious
bottleneck between 2 routers along the route ?

If they are always the same, then you can signal that to your ISP.

If the bottleneck is between your border router and your ISP's
customer-facing router, it means that the line between you and the ISP
is overloaded.

Not sure how it works in the USA, but in Canada, the telco handles the
DSL line between the CO and the customer, and from the DSLAM, it goes to
the BAS (access server) which then uses ATM circuits to deliver your
packets to yor ISP. The BAS is usually in a central central office and
combines traffic from many DSLAMs in various regional/suburban COs.


If the telco oversubscribes circuits between the DSLAM and the BAS, it
will affect performance and your ISP won't be able to see anything
wrong. However, your ISP must them complain to the TELCO and if enough
local customers complain, then the telco will look into capacity issues
and may upgrade the ATM circuits between your DLSAM and BAS to handle
the additional capacity.


If you could tunnel DECNET over TCPIP, you might be able to use SET HOST
(CTERM protocol) which is much more efficient for character cell interfaces.
.

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