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.khre...@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-boun...@lists.digium.com [mailto: > asterisk-users-boun...@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@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 > > -- > _____________________________________________________________________ > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > New to Asterisk? Join us for a live introductory webinar every Thurs: > http://www.asterisk.org/hello > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users >
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