nanog mailing list archives
Re: How to Blocking VoIP ( H.323) ?
From: "Alexei Roudnev" <alex () relcom net>
Date: Fri, 12 Nov 2004 09:46:15 -0800
On Thu, 11 Nov 2004, Alexei Roudnev wrote:Date: Thu, 11 Nov 2004 09:38:00 -0800 From: Alexei Roudnev <alex () relcom net> To: Christopher L. Morrow <christopher.morrow () mci com>, Irwin Lazar <ilazar () burtongroup com> Cc: Joe Shen <joe_hznm () yahoo com sg>, NANOG <nanog () merit edu> Subject: Re: How to Blocking VoIP ( H.323) ? Hmm - just introduce some jitter into your network, and add random delay
to
the short packets - and no VoIP in your company -:).Alexei: How exactly then would anyone implement this, without screwing-up the overall performance elements in the network? :)
Not too easy, but I can imagine few alghoritms doing it. Remember that VoIP uses short packets, and you cam always recognize Ack and Tcp packets which should not be disrupted. Jitter does not slow down network, except if it interacts with RTT calculartion in TCP/IP.
To Joe Shen: Perhaps 'I am failing to see it' but, what can be gained by blocking VoIP traffic other than freeing bandwidth and CPU churnings? In the grand scheme of things, and in an evolutionary context certainly, many apps are likely to be proposed in the future, and worse still (in the eyes of many) - IMPLEMENTED, which will likely compel network owners and operators to adjust organizational and infrastructure strategies to meet objectives. As with the introduction of any service or app into the mix, accommodating something means a REQUISITE adjustment in existing operational practices. But WRT VoIP, Consider that by JUST ONE account, the IP telephony market is expected to be a US$1.4 billion business by 2008 - up from $934 million in 2002. This market is expected to experience a annual growth rate of 7.5% through 2008. Again, what is the point.. is it that you wish to block VoIP to in order to DELAY/BUY MORE TIME toward implementing organizational change (slow-rolling, if you are going to be rolling at all), or is it to prohibit without reservation, any VoIP traffic over your netspace? Just curious.. Best, Robert. -------
Current thread:
- Re: How to Blocking VoIP ( H.323) ?, (continued)
- Re: How to Blocking VoIP ( H.323) ? Robert Mathews (Nov 11)
- Re: How to Blocking VoIP ( H.323) ? Christopher L. Morrow (Nov 11)
- Re: How to Blocking VoIP ( H.323) ? Robert Mathews (Nov 11)
- Re: How to Blocking VoIP ( H.323) ? Joe Shen (Nov 12)
- Re: How to Blocking VoIP ( H.323) ? Alexei Roudnev (Nov 12)
- Re: How to Blocking VoIP ( H.323) ? Christopher L. Morrow (Nov 12)
- Re: How to Blocking VoIP ( H.323) ? Alexei Roudnev (Nov 13)
- Re: How to Blocking VoIP ( H.323) ? Christopher L. Morrow (Nov 13)
- Re: How to Blocking VoIP ( H.323) ? Robert Mathews (Nov 13)
- Re: How to Blocking VoIP ( H.323) ? Simon Leinen (Nov 12)
- Re: How to Blocking VoIP ( H.323) ? Alexei Roudnev (Nov 12)
- Re: How to Blocking VoIP ( H.323) ? Robert Mathews (Nov 13)
- Re: How to Blocking VoIP ( H.323) ? Alexei Roudnev (Nov 13)
- Re: How to Blocking VoIP ( H.323) ? joshua sahala (Nov 13)
- Re: How to Blocking VoIP ( H.323) ? Suresh Ramasubramanian (Nov 13)
- Re: How to Blocking VoIP ( H.323) ? John Curran (Nov 13)
- Re: How to Blocking VoIP ( H.323) ? Alexei Roudnev (Nov 13)
- Re: How to Blocking VoIP ( H.323) ? just me (Nov 12)
- Re: How to Blocking VoIP ( H.323) ? Alexei Roudnev (Nov 11)
- Re: How to Blocking VoIP ( H.323) ? Randy Bush (Nov 11)