Well, I can write them myself, as I found the need for it after a bit
of research.
As you know, ADSL lines have a rather small uplink. 1Mbit/s maximum
(Can be more with some standards but, let's just assume this)
I often found the need to use such a link in places where there were a
significant number of users, and either the company policy was not to
limit users/services or, just wouldn't care. In either case, I found
that for the uplink to be usable, I had to find out which services
were more critical, intermediate and "trash". With this information, I
would now be able to setup a simple traffic shaping to control which
services have priority...
The problem of this approach, related to what we are discussing, is
that when using a lot of those ADSL modem supplied by the ISP's, those
devices tend to apply a cache of their own.
Now assume that you have a 512Kbits/s uplink and you have a constant
stream of data of 1Mbits/s, during 5 seconds. The ADSL router will
fill up it's cache almost immediately.
Now assume that, on second 5 you get a critical priority packet. In a
lot of circumstances, the ADLS router/modem will take several seconds
to relay your critical packet.
This happens, among other things, because most of the time, your
router/modem is not aware of there critical packets, defined by you,
combined with somewhat larger caches than 512Kbits.
Now, most of those ISP modes/routers do support PPPoE bridging. With
this feature you can setup up a Linux machine to act as a router,
instructing pppd to initiate the connection itself (using PPPoE plugin
from pppd). This way you have a constant control over every packet.
For example, you can have 2Mbits of data standing by and relay a high
priority packet (almost) immediately.
Hope I was made myself clear :)
Regards,
Rui
On Mon, Dec 23, 2013 at 12:07 PM, jdd
Le 23/12/2013 12:25, Rui Santos a écrit :
Hi jdd,
Not only. I usually use it to make a PPPoE connection to my ISP directly. It has some advantages. The modules sets up a ppp connection using the PPPoE plugin automaticaly. I can do it manually... but would prefer to do it with YaST, as usual :)
sure. never used it since the early adsl days (not even sure I ever needed it)
som link to a page explaining the advatages?
thanks
jdd
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