Re: [Astlinux-users] PPPoE Keepalive

[Lonnie A. <li...@lo...>]

Hi Michael,

Nicely described issue.

1) Adjust lcp-echo-* settings (requiring AstLinux 1.4.1 or later)

By default the pppoe ppp peer options include:
--
lcp-echo-interval 20
lcp-echo-failure 3
--

Try adding a PPPOE_PPP_OPTIONS variable in your /mnt/kd/rc.conf.d/user.conf file:
--
PPPOE_PPP_OPTIONS="lcp-echo-interval 5 lcp-echo-failure 10"
--
or also add lcp-echo-adaptive
--
PPPOE_PPP_OPTIONS="lcp-echo-interval 5 lcp-echo-failure 10 lcp-echo-adaptive"
--

Test and adjust values accordingly.


2) Adjust QoS

Possibly (AstLinux 1.4.4 or later) CAKE support in the traffic shaper would help, but no evidence it would.


3) Changing the service to IPoE

I have always thought to avoid PPPoE if possible, so if IPoE is an available choice, that may be a good idea.


Lonnie



> On Feb 8, 2022, at 10:49 PM, Michael Knill <mic...@ip...> wrote:
> 
> Hi Group
>  
> I have a site that for years intermittently has periods where it loses PPPoE connectivity on a regular basis. After further investigation by one of my techs, it appears that when this is happening there is significant upstream congestion on the service due to a Veeam backup in progress.
> Note that I have set traffic shaping and the voice is not affected however it is when the PPPoE drops the connection e.g.
> Feb  9 12:40:33 3060-ETS_Ref-CM1 daemon.info pppd[362]: No response to 3 echo-requests
>  
> We have always blamed the access provider but have not been able to pinpoint the issue. I'm now thinking that possibly during this high congestion, LCP Echo Request/Reply are being delayed and/or dropped meaning that Astlinux thinks connectivity is lost and it resets the connection.
>  
> So my questions are:
> 	• Is this possible?
> 	• If so, how can I fix it? Something in QoS? Can I change the PPPoE parameters for LCP echos maybe?
> 	• Would changing the service to IPoE fix the problem e.g. only DHCP then?
>  
> Thanks all.
> Regards
>  
> Michael Knill
> Managing Director
>  
> D: +61 2 6189 1360
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