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RFC 2205 http://tools.ietf.org/html/rfc2205
RFC 2750 http://tools.ietf.org/html/rfc2750

draft http://info.internet.isi.edu:80/in-drafts/files/draft-ietf-rsvp-spec-16.txt
draft http://info.internet.isi.edu:80/in-drafts/files/draft-ietf-rsvp-md5-06.txt

RSVP is a Resource ReSerVation setup Protocol designed for an integrated services Internet. It is used by a host on behalf of an application data stream to request a specific quality of service from the network for particular data streams or flows. It is also used by routers to deliver QoS control requests to all nodes.
(Compliant with IETF draft-ietf-rsvp-spec-13.txt 08-1996 and IETF draft-ietf-rsvp-md5-02.txt 06-199.)

The format of the header is shown in the following illustration:

4
8
16
32 bits

Ver

Flags

Message type

RSVP checksum

Send TTL

(Reserved)

RSVP length

RSVP header structure

Version
The protocol version number, this is version 1.

Flags
No flag bits are defined yet.

Message type
Possible values are:

1 Path.
2 Resv.
3 PathErr.
4 ResvErr.
5 PathTear.
6 ResvTear.
7 ResvConf.

RSVP checksum
The checksum.

Send TTL
The IP TTL value with which the message was sent.

RSVP length
The total length of the RSVP message in bytes, including the common header and the variable length objects that follow.

Vulnerabilities for this protocol (from CVE)

CVE ID Protocol Source Port Targetport

TCP/IP Protocols:

AHARP/RARPATMPBGP-4COPSDCAPDHCPDNS
DVMRPEGPEIGRPESPFANPFingerFTPHSRP
HTTPICMPICMPv6IGMPIGRPIMAP4IPIPDC
IPv6ISAKMPL2FL2TPLDAPMARSMobile IPNARP
NetBIOS/IPNHRPNTPOSPFPIMPOP3PPTPRadius
RIP2RIPng for IPv6RLOGINRSVPRTSPRUDPS-HTTPSCTP
SLPSMTPSNMPSOCKS V5TACACSTALITCPTELNET
TFTPUDPVan JacobsonVRRPWCCPX-WindowXOT