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DerJudge

Member

From: NRW, Germany

Registered: 2013-03-26

Posts: 24

Website

[SOLVED] Using mosh client

Hi everyone,

I just thought that it was time to give mosh a try.
I installed community/mosh 1.3.2-1 on my server and 1.2.5-2 on my client (Mint). I then applied the following firewall rule on my server:

iptables -A INPUT -p udp -m multiport --dports 60000:61000 -m comment --comment "MOSH Ports" -j ACCEPT

When I then connect to my server using

mosh user@myserver

it seems to work: "ps" shows a running instance of mosh and the pkts and bytes - count for that new iptables rule grows by 1 package / ~100 bytes:

10:15 root@tango003:~# ps wwaux | grep mosh
root     16572  0.7  0.0  52552  5240 ?        S    10:15   0:00 mosh-server new -c 8 -s -l LANG=de_DE.UTF-8 -l LANGUAGE=
root     16594  0.0  0.0  13192  2228 pts/8    S+   10:15   0:00 grep --colour=auto mosh
10:15 root@tango003:~# iptables -L -v -n | grep -i mosh
    3   297 ACCEPT     udp  --  *      *       0.0.0.0/0            0.0.0.0/0            multiport dports 60000:61000 /* MOSH Ports */
10:22 root@tango003:/etc/ssh#

So far so good.
But also, I notice the following things:

1. When I type, I do not see any of mosh's promises like "no delay due to local echo" kept; even I have quite a good line, I can notice a delay for the echo of typed characters when hitting the keys fast. Also, I do not see that "server has acknowledged receiving" - bold from mosh's demo video.

2. The Firewall counter does not grow after the initial connection anymore. I would have expected to have it grown ongoing while I utilize the mosh connection.

Does anybody have an idea why this is?

Last edited by DerJudge (2017-08-15 08:50:21)

DerJudge

Member

From: NRW, Germany

Registered: 2013-03-26

Posts: 24

Website

Re: [SOLVED] Using mosh client

Let me give answers here myself:

1. mosh's UDP ports seem to not be utilized for all data but only for synchronisation in some situations, when the line was gone to re-establish the connection and to exchange the diffs.

2. The reason I did not see those underlined characters on delay is that my line quality was just too good As soon as I disconnect and continue typing, I see that I indeed deal with an predictive local echo and that I am missing some server confirmations and see underlined characters.