MPD5 max allowed PPPoE speed?

[rihad]

It says in FreeBSD kernel source file /usr/src/sys/netgraph/ng_ppp.h

/* Max allowable link latency (miliseconds) and bandwidth (bytes/second/10) */
#define NG_PPP_MAX_LATENCY      1000            /* 1 second */
#define NG_PPP_MAX_BANDWIDTH    125000          /* 10 Mbits / >second */

Does this mean that ADSL2+ max bandwidth would be artificially limited to 10 mbit/s? :(

[Alexander Motin]

No. That bandwidth value is used only for multilink load balancing and in any way for traffic limitation. And at rates to 10Mbit/s precise balancing becomes somewhat complicated any way.

[rihad]

Hi, Alexander, the problem was described here in 2008: http://www.opennet.ru/openforum/vsluhforumID1/78907.html

although it's in Russian, I hope you can read it :)

There the author was definitely hitting the kernel limit of 10mbit/s imposed by ng_ppp when using PPPoE.

So you're saying that if I'm not going to use traffic limiting on the MPD box, then I'm fine? I can use DSLAMs & other FreeBSD servers (not using ng_ppp) for that.

[Alexander Motin]

Should I repeat again? Fine! ng_ppp node does not limit traffic bandwidth. Period. Unless you are using multilink this option and this maximal value are simply not existing for you. You may limit bandwidth even at higher levels using FreeBSD, but by using other means: ng_car, dummynet, ...

[rihad]

Thanks. But what about these bandwidth settings that I never configured?

[L1] show bundle
Bundle 'B1' (static):
    Links          : L1[Opened/UP] 
    Status         : OPEN
    Session time   : 306 seconds
    MultiSession Id: 4276480-B1
    Total bandwidth: 64000 bits/sec
    Avail bandwidth: 64000 bits/sec

[L1] show link
Link L1 (static):
Configuration:
    Device type    : pppoe
    MRU            : 1500 bytes
    MRRU           : 2048 bytes
    Ctrl char map  : 0x000a0000 bytes
    Retry timeout  : 2 seconds
    Max redial     : no redial
    Bandwidth      : 64000 bits/sec
    Latency        : 2000 usec
    Keep-alive     : every 5 secs, timeout 40

Are they in effect?

[Alexander Motin]

They are used for multilink balancing. Nothing else.

[rihad]

Ok, thanks, Alexander.