[jdev] XEP-0199 (XMPP Ping) to test reliability

[Tomasz Sterna]

On Śr, 2008-01-23 at 09:49 +0100, Yann Leboulanger wrote:
> > Other option is immediate detection of broken connection by
> receiving
> > NACK. This also is signalled to the application level.
> 
> That sound a bit hard to disconenct when the first packet is not
> received :)

When the receiving party explicitly denies accepting a packet,that means
that there is no connection anymore.
There is nothing more you can do but reconnect.


> you know what "reasonable defaults" means ? some minutes ?

Examples:

$ cat /proc/sys/net/ipv4/tcp_keepalive_time 
7200
$ cat /proc/sys/net/ipv4/tcp_retries1 
3
$ cat /proc/sys/net/ipv4/tcp_retries2
15
$ cat /proc/sys/net/ipv4/tcp_synack_retries 
5
$ cat /proc/sys/net/ipv4/tcp_syn_retries 
5

There are many more.
Tuning them requires good knowledge of TCP internals.


-- 
  /\_./o__ Tomasz Sterna
 (/^/(_^^' http://www.xiaoka.com/
._.(_.)_   im:smoku at xiaoka.com