Re: [lwip-users] question about lwIP retransmistion

[Kieran Mansley]

On Sat, 2009-03-21 at 21:15 +0800, yueyue papa wrote:
> Hi All,
>  
> What is time for retransmistion happen if one TCP segment data send
> out is losted(without not get ACK from remote)?

It's variable, not a fixed time, as per the TCP spec.  If you're talking
about the first time a packet is retransmitted then it could be anything
from the round trip time of the network (if the "fast retransmission"
algorithm gets triggered by subsequent packets and ACKs) or roughly the
time before the TCP slow timer expires (about 500ms).

> Whether the time is reconfigerable?

You can change the frequency of the slow timer, but I wouldn't advise
this unless you know what you're doing: it will have other side effects.

Kieran