Control of host/server processing overload...

Hello,

I am interested in understanding if the Internet Traffic Engineering =
Working Group has considered the following issue: control of processing =
overload of hosts/servers running protocols such as DNS, LDAP, SIP, =
HTTP, COPS, SNMP, Radius, and Diameter.=20

My impression from a brief trawl is that, within the IETF, much thought =
has been, and is being, given to the management of bandwidth and router =
congestion, but almost none to control of host and server processing =
overload. Indeed, although some of the above listed protocols do provide =
response or status codes that might be used to indicate processing =
overload, I have found none which explicitly specifies an overload =
control mechanism.

The same conclusion also seems to apply to the following non-IETF =
protocols: H.323, SOAP, SAML, SMPP, and Parlay.

This contrasts with the telephony/ATM world where there are examples of =
protocols that have built-in overload control features: INAP, ISUP, =
BICC, PNNI and more recently H.248.11.  Such controls are crucial during =
extremes of network operation where surges of service requests (or =
Denial of Service attacks) can be an order of magnitude greater than =
normal demand levels.=20

Please can you advise me of any work that is addressing this area.

Thanks in advance for your help

Martin Whitehead=20
BTexact
Performance Engineering
Critical Solutions Performance   =20
Tel. 01473 605430      	Fax 01473 623
BT MeetMe 0870 241 2993  Participant passcode 137305=20
PP 9, Floor 1 Orion Building, Adastral Park, Martlesham Heath. Ipswich,  =
Suffolk IP5 3RE

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