[OZAPRS] VKMAIL server observation

[Tony Hunt]

Very interseting on the INTERNET INETZ zones Richard.. How do you propose
to
get around Igate Looping problems ?? If 2 Igates hear the same packet and
put it to the net at the same time thats fine but is there any form of
dupe
checking the otherway around back into the RF network ??

Tony Hunt vk5ah
>
> [Richard Hoskin]
>
> The INETZ0 etc is the IGate Zoning system we us in VK3.
> You could look at it in a similar way to a mobile phone cell or a radio
> voting system.
>
> The Zoning system provides good (VK*) internet to RF traffic flow to the
> full RF network while minimising the RF traffic levels.
>
> We have one central Transmitter IGate (VK3SB) for the network and 3
(soon
to
> be 4) Receive only IGates placed at selected locations (Zones) around
the
> network.
>
> The theory is that any station will never be more that 2 Hops from a
> Receiving IGate so all mobile stations only need to use RELAY WIDE and
all
> home stations can use a direct path to the closest Receiving IGate. By
> reducing the path length you reduce RF traffic levels.
>
> The Transmitter IGate packets flow from roughly the centre to the edge
of
> the network. This means that a station at one end of the network will
see
> all traffic from the other end even though all paths are only local. (In
> effect we are using the Internet as a backbone traffic network)
>
> NOTE: It is Very Important that ONLY the Transmitter IGate is to use
INETZ
> Zoning.
>
> As we are still to establish the final Receiving IGate there is a hole
in
> the IGate coverage in the North of the state which means all station in
the
> north must use a minimum of 3 Hops to get to a Receiving IGate. Hence
all
> Mobiles need to use the path of RELAY,WIDE2-2 when travelling in the
North.
> In all other areas they only need to use RELAY,WIDE but that can get a
bit
> confusing so I advocate that all mobiles use RELAY,WIDE2-2 for now and
all
> Home station use a direct path to their local IGATE.
>
> For APRS Messaging: the local Receiving IGates transmit as well as
receive
> local messages. So any message considered local (normally 1 or 2 hops
from
> the originator) will be sent to the originator via the local IGate. This
is
> done to increase the reliability of APRS message reliability.
>
> The system does produce some duplication of packets but as this is at
the
> edge of the network where RF traffic levels are low (normally 20 to 30
> packets per 10 min) it is not a problem. Where the RF traffic level is
high
> (Over 100 packets per 10 min) there is no duplication. Infact there is a
> reduction in duplicated packets and RF traffic in the centre of the
network
> as you do not see multiple hop packets bouncing around the RF
digipeaters.
>
> Any APRS packet duplication on the Internet is taken care of by the APRS
IS
> (Internet Servers) and IGates.
>
> This design will really show it's efficiencies when we have the 4th
> Receiving IGate running and all paths can be reduced to a maximum of 2
hops.
>
> The education of all VK3 users and visitors to us the reduced paths will
be
> a challenge.
>
> Cheers
> Richard
> VK3JFK
>
>
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