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oza.4h07 at gmail.com
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 Posted: Thu Mar 03, 2016 11:32 am Post subject: [asterisk-users] Rasterisk freeze on 4G link |
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Hello,
I'm remotely managing an asterisk setup using an OpenVPN client on this Asterisk box, connecting to an OpenVPN server of mine).
This box is mainly connected to PSTN.
It is also connected to the Internet, only for remote management.
The former ADSL link has recently been replaced by a new 4G link (UMTS).
I'm connecting to this box from a Debian Jessie/Gnome Terminal combo.
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.
What would you suggest ?
Best regards
PS: I was about to determine best MTU value but I always thought a punishment for a bad MTU value would be a lower throughput, not a screen freeze. Is it correct ? |
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toufic.khreish at gmai...
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| Posted: Thu Mar 03, 2016 11:41 am Post subject: [asterisk-users] Rasterisk freeze on 4G link |
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Please set correct MTU at server side, it is definitely an MTU issue.
Sent from my iPhone
| Quote: | On Mar 3, 2016, at 5:31 PM, Olivier <oza.4h07@gmail.com> wrote:
Hello,
I'm remotely managing an asterisk setup using an OpenVPN client on this Asterisk box, connecting to an OpenVPN server of mine).
This box is mainly connected to PSTN.
It is also connected to the Internet, only for remote management.
The former ADSL link has recently been replaced by a new 4G link (UMTS).
I'm connecting to this box from a Debian Jessie/Gnome Terminal combo.
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.
What would you suggest ?
Best regards
PS: I was about to determine best MTU value but I always thought a punishment for a bad MTU value would be a lower throughput, not a screen freeze. Is it correct ?
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_____________________________________________________________________
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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:
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duncan at e-simple.co.nz
Guest
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| Posted: Thu Mar 03, 2016 12:09 pm Post subject: [asterisk-users] Rasterisk freeze on 4G link |
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| Quote: | On 4/03/2016, at 5:31 AM, Olivier <oza.4h07@gmail.com> wrote:
Hello,
I'm remotely managing an asterisk setup using an OpenVPN client on this Asterisk box, connecting to an OpenVPN server of mine).
This box is mainly connected to PSTN.
It is also connected to the Internet, only for remote management.
The former ADSL link has recently been replaced by a new 4G link (UMTS).
I'm connecting to this box from a Debian Jessie/Gnome Terminal combo.
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.
You will probably also break it with any large text dump eg cat /var/log/syslog will also do it
| Quote: | What would you suggest ?
Best regards
PS: I was about to determine best MTU value but I always thought a punishment for a bad MTU value would be a lower throughput, not a screen freeze. Is it correct ?
--
_____________________________________________________________________
-- 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
|
--
_____________________________________________________________________
-- 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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oza.4h07 at gmail.com
Guest
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| Posted: Thu Mar 03, 2016 1:16 pm Post subject: [asterisk-users] Rasterisk freeze on 4G link |
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2016-03-03 18:08 GMT+01:00 Duncan Turnbull <duncan@e-simple.co.nz (duncan@e-simple.co.nz)>:
| Quote: |
| Quote: | On 4/03/2016, at 5:31 AM, Olivier <oza.4h07@gmail.com (oza.4h07@gmail.com)> wrote:
Hello,
I'm remotely managing an asterisk setup using an OpenVPN client on this Asterisk box, connecting to an OpenVPN server of mine).
This box is mainly connected to PSTN.
It is also connected to the Internet, only for remote management.
The former ADSL link has recently been replaced by a new 4G link (UMTS).
I'm connecting to this box from a Debian Jessie/Gnome Terminal combo.
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.
| Quote: |
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).
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pete at fiberphone.co.nz
Guest
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| Posted: Thu Mar 03, 2016 1:16 pm Post subject: [asterisk-users] Rasterisk freeze on 4G link |
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Oliver,
Not correct!
Duncan and Toufic are spot-on with their answers.
Pete
| Quote: | On 4/03/2016, at 5:40 am, Toufic Gmail <toufic.khreish@gmail.com (toufic.khreish@gmail.com)> wrote:
| Quote: | | PS: I was about to determine best MTU value but I always thought a punishment for a bad MTU value would be a lower throughput, not a screen freeze. Is it correct ? |
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pete at fiberphone.co.nz
Guest
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| Posted: Thu Mar 03, 2016 1:23 pm Post subject: [asterisk-users] Rasterisk freeze on 4G link |
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These are not Asterisk related questions. It is a common problem. Google is your friend. Try something like 'console stalls with big packets'.
To answer your question "why", it's simple. "Because the big packets are being dropped".
Pete
| Quote: | On 4/03/2016, at 7:15 am, Olivier <oza.4h07@gmail.com (oza.4h07@gmail.com)> wrote:
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 ?
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duncan at e-simple.co.nz
Guest
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| Posted: Thu Mar 03, 2016 3:02 pm Post subject: [asterisk-users] Rasterisk freeze on 4G link |
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| Quote: | With this new link, whenever I launch a vim, a nano or a rasterisk session, my terminal freezes (rasterisk) or remains empty (nano, vim).
|
| Quote: | | Quote: | >
| Quote: | 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.
| Quote: |
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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toufic.khreish at gmai...
Guest
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| Posted: Thu Mar 03, 2016 3:27 pm Post subject: [asterisk-users] Rasterisk freeze on 4G link |
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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@lists.digium.com [mailto:asterisk-users-bounces@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
| Quote: | With this new link, whenever I launch a vim, a nano or a rasterisk session, my terminal freezes (rasterisk) or remains empty (nano, vim).
|
| Quote: | | Quote: |
| Quote: |
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.
| Quote: |
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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