Support for Quality of Service

[MauJFernandezUVR]

Hi, I was looking for a package like this one, but what I was searching specifically was QoS support, do you have any plans to add it?

Thanks.

[stephenwvickers]

This is quite tricky, and would be something the raw-socket module (also my module) would have to support.

Are you enquiring specifically about QoS support for ICMP ping messages, or QoS for packets in general?

[MauJFernandezUVR]

Right now specifically for ICMP ping messages, but a general QoS support for the raw-socket module might open some possibilities for me to develop tools at my work.

[stephenwvickers]

For Windows it's not simple, and would require using the QoS API specifically exposed to work with QoS, something that would not be done anytime soon I'm afraid because of work commitments.

If you are working with Linux however, you could try the IP_TOS socket option. First identify the value for your local system (using IPTOS_THROUGHPUT here as an example):

$ grep -R IP_TOS /usr/include/*
/usr/include/bits/in.h:#define        IP_TOS          1       /* int; IP type of service and precedence.  */
/usr/include/linux/in.h:#define IP_TOS          1
...
$ grep -R IPTOS_THROUGHPUT /usr/include/*
/usr/include/linux/ip.h:#define IPTOS_THROUGHPUT        0x08
/usr/include/netinet/ip.h:#define       IPTOS_THROUGHPUT        0x08
...

Then use this to set the socket option before you use the net-ping session (assumes latest version of net-ping):

var ping = require("net-ping")
var raw = require("raw-socket")

var session = ping.createSession(...)

var level = raw.SocketLevel.IPPROTO_IP
var option = 1 // IP_TOS
var value = new Buffer([0x08]) // IPTOS_THROUGHPUT

session.getSocket().setOption(level, option, value, value.length)

// Then go on to session.pingHost() etc.

See the raw-socket docs for more information on the setSocket() method.

Steve

[stephenwvickers]

Just realised, we already expose the IP_TOS option, so this would actually be:

var ping = require("net-ping")
var raw = require("raw-socket")

var session = ping.createSession(...)

var level = raw.SocketLevel.IPPROTO_IP
var option = raw.SocketOption.IP_TOS
var value = new Buffer([0x08]) // IPTOS_THROUGHPUT

session.getSocket().setOption(level, option, value, value.length)

// Then go on to session.pingHost() etc.

[MauJFernandezUVR]

Sorry for the delay, I've been dragged with another things at work, I'll try it when I find time to code it, it looks really promising.

Thanks for the help!