[DUG] Heartbeat packets

[Jeremy Coulter]

Yeah, well to be honest, this is usually going to be on a VPN or an
internall network, so firewalls wont be too much of an issue. I figure if
Ican get it "stable" over the internet, its gotta be pretty table in a VPN
and internal networking situation :-)

Jeremy 

-----Original Message-----
From: delphi-bounces at ns3.123.co.nz [mailto:delphi-bounces at ns3.123.co.nz] On
Behalf Of Ben Taylor
Sent: 15 October 2005 12:57
To: NZ Borland Developers Group - Delphi List
Subject: Re: [DUG] Heartbeat packets

technically, yes.
practically, preferably not.

udp is an unreliable protocol, so packets may be lost (especially on busy
networks) or may even be blocked at a router/firewall.

also has the downside of more code to write/maintain. firewalls would need 2
ports opened instead of one. you'd have to have a link between the udp and
tcp components to detect the timeout and perform the disconnect.

you could just open 2 tcp connections, that would remove some of those
issues. still not as clean as a single connection though.

b.

> I was wondering, would UDP on the same port be ok for sending these 
> "heartbeat" packets?
> What I am looking at here is that I can use the same port for TCP as 
> for UDP.
>  
> Wouldt this idea work ok?
>  
> Jeremy
> 
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