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Allied Telesis AR400 Series Come fare
More about idle times
In the previous section we set an idle timeout on PPP, on the Linux device This means that after
30 seconds of idle time PPP will send a Link Control Protocol (LCP) message with a Termination
Request. The Allied Telesis device responds with a Termination Ack. PPPoE then takes over and
both devices finish the connection with a PADT frame.
In Linux, you can set a PPPoE idle timeout. This means that PPPoE will go straight to sending a
PADT and PPP itself will not get the opportunity to send an LCP Termination Request. Allied
Telesis devices will ignore a PADT frame if it is not preempted by an LCP Termination Request,
so nothing will happen on the Allied Telesis device when pppoe takes down the connection on
the Linux device.
To set a PPPoE idle timeout (30 seconds in this example):
[root@linux_client michael]# pppd pty 'pppoe -I eth1 –U –T 30'
Compression
The Van Jacobson style TCP/IP header (VJ) compression is now standard on PPP links . It is
supported in both Allied Telesis and Linux PPP.
To turn on VJ compression on the Allied Telesis device:
set ppp template=1 vjc=on
VJ compression should be on your linux device by default. However, check the PPP options file
to ensure that the VJ compression has not been disabled.
[root@linux_client michael]# cat /etc/ppp/options
lock
noauth
noipdefault
usepeerdns
# Comment out or delete the following line if it exists
#novj
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