[asterisk-users] Rasterisk freeze on 4G link [SOLVED]

[Olivier]

Thank you all for pointing me in the right direction.

Now I learned I have to care about MTU.

Best regards

2016-03-03 21:27 GMT+01:00 Toufic Khreish (Gmail) <toufic.khreish at gmail.com>
:

> Hello,
>
>
>
>
>
> You need to determine the correct MTU value by doing the following:
>
>
>
> ping www.google.com -f -l 1400 and you go up or down
>
>
>
> An example:
> 1440 Max packet size from Ping Test
> + 28 IP and ICMP headers
> 1468 is your optimum MTU Setting
>
>
>
> Reference : http://www.tp-link.fr/FAQ-190.html
>
>
>
> Once you determine the correct MTU you just set it on the VPN server, it
> will not break any connection the worst will be slow connection that is all.
>
>
>
> From my experience the MTU value for 3G was 1400.
>
>
>
> Best regards
>
> Toufic
>
>
>
>
>
> *From:* asterisk-users-bounces at lists.digium.com [mailto:
> asterisk-users-bounces at lists.digium.com] *On Behalf Of *Duncan
> *Sent:* Thursday, March 03, 2016 9:02 PM
> *To:* Asterisk Users Mailing List - Non-Commercial Discussion <
> asterisk-users at lists.digium.com>
> *Subject:* Re: [asterisk-users] Rasterisk freeze on 4G link
>
>
>
> > With this new link, whenever I launch a vim, a nano or a rasterisk
> session, my terminal freezes (rasterisk) or remains empty (nano, vim).
>
> >
> > When a session is frozon, I can open a new one at the same so it
> excludes a basic connectivity loss.
> >
> Usually incorrect MTU gives you this effect. Use ping with MTU size set to
> test and find what works.
>
> I think its value: it's 1272, which amazes me.
>
>
> You will probably also break it with any large text dump eg cat
> /var/log/syslog will also do it
>
>
>
> Yes  "cat /var/log/syslog" also broke my console.
>
> Why would my console break because of inadequate MTU and other PC on the
> same location, seem unaffected ?
>
> Because, they most probably mostly use SMTP and HTTP ?
>
> Is possible to simulate a given MTU on a LAN to reproduce such freezes ?
>
> (the remote location is at the other side of the country and I would like
> to prepare things as much as possible).
>
>
>
>
>
> I think you need to go through a router or some device that can constrain
> the MTU. But live changing your server MTU should be straight forward as
> openvpn should try and reconnect, and you can change the server back. I
> haven't lost connectivity before with this
>
> Also the session is probably timed out rather than gone, in 10-15 mins
> maybe less it will come back (or does for me)
>
> Cheers Duncan
>
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