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RFC 1144 http://tools.ietf.org/html/rfc1144

Van Jacobson is a compressed TCP protocol which thereby improves the TCP/IP performance over low speed (300 to 19,200 bps) serial links.

The format of the compressed TCP is as follows:

 

 

C

I

P

S

A

W

U

Connection number (C)

TCP checksum

Urgent pointer (U)

D Window (W)

D Ack (A)

D Sequence (S)

D IP ID (I)

data

Compressed TCP structure

C, I, P, S, A, W, U
Change mask. Identifies which of the fields expected to change per-packet actually changed.

Connection number
Used to locate the saved copy of the last packet for this TCP connection.

TCP checksum
Included so that the end-to-end data integrity check will still be valid.

Urgent pointer
This is sent if URG is set.

D values for each field
Represent the amount the associated field changed from the original TCP(for each field specified in the change mask).

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