[OZAPRS] HF Gateways
James Cameron VK2LQZ
vk2lqz at wia.org.au
Mon Jun 29 18:20:01 EST 2009
On Mon, Jun 29, 2009 at 06:06:32PM +1000, Ray Wells wrote:
> With numbered ax25 frames the "within reason" is determined by RETRY
> which is typically 10. Is the TCP/IP equivalent the TTL (Time To Live)
No. TTL determines how many times a single packet is repeated by
internet routers and gateways before it is no longer repeated.
The amount of time a TCP connection may be stalled doing retries is
determined by (a) any keep-alive setting of the operating system or
application, or (b) any timer in the application that eventually gives
up and announces a timeout.
TCP retries use an exponential backoff. I'm not yet sure what AX.25
uses. Still learning AX.25.
APRS uses "if it didn't get through, don't worry, we'll send another one
James Cameron mailto:quozl at us.netrek.org http://quozl.netrek.org/
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