Hello, Thank you very much for the answer. That clears it up.
I reckon specifying '-K' on dbclient would then do the same as ServerAliveInterval. Cheers, Daniel On Wed, 18 Mar 2020 at 14:58, Matt Johnston <m...@ucc.asn.au> wrote: > Hi Daniel, > > -K is equivalent to the OpenSSH ClientAliveInterval. The server will send > traffic to check that the connection is open. > > -I will disconnect if there is no traffic for a certain time interval. It > won't try to send any traffic over the connection, it just passively looks > at what traffic is being sent. > > Note that it seems that currently -K messages will cause the -I idle timer > to reset which isn't right, there's a pull request > https://github.com/mkj/dropbear/pull/90 which I will merge soon. > > Cheers, > Matt > > > > On Wed 18/3/2020, at 7:22 pm, Dániel Fancsali <fancs...@gmail.com> > wrote: > > > > Hello, > > > > First of all, let me just say this: awesome piece of software. Cheers! > > > > I am, however, a bit confused about the idle/keepalive settings. I have > been working with OpenSSH quite a bit, and do understand the concepts > around ServerAlive and ClientAlive as well as the TCPKeepAlive settings. > But I still struggle to wrap my head around -K and -I in dropbear. It's a > tad bit unclear which one maps to which one; or in other words, which one > happends on what layer. > > > > Maybe, my mistake here is trying to understand those in the context of > the OpenSSH settings, but on some level, it's the same protocol. > > > > So, looking at the code, I think this is what happens: > > - Setting -Kx will send an ssh packed every x seconds, and if there's no > answer 3 times in a row, it considers the connection to be dead. So this is > essentially ServerAlive/ClientAlive mechanism. > > - Specifying -Iy would say, if there's no incoming or outgoing data for > y seconds, it considers the connection dead. So this is sort of the others > side of the TCP keepalive coin. > > > > Is my understanding correct? If not, can someone please shed some light > on this for me? > > > > Regards, > > Daniel > >
