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Protocols - EGP

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RFC 904 http://tools.ietf.org/html/rfc904

The Exterior Gateway Protocol (EGP) exists in order to convey net-reachability information between neighboring gateways, possibly in different autonomous systems. The protocol includes mechanisms to acquire neighbors, monitor neighbor reachability and exchange net-reachability information in the form of Update messages. The protocol is based on periodic polling using Hello/I-Heard-You (I-H-U) message exchanges to monitor neighbor reachability and Poll commands to solicit Update responses.

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

EGP Version Type Code Status
Checksum Autonomous System number
 Sequence number  
1 byte 1 byte 1 byte 1 byte
EGP structure

EGP version
The version number. This version is version 2.

Type
Identifies the message type.

Code
Identifies the message code.

Status
Contains message-dependent status information.

Checksum
The EGP checksum is the 16-bit one's complement of the one's complement sum of the EGP message starting with the EGP version number field. When computing the checksum the checksum field itself should be zero.

Autonomous System Number
Assigned number identifying the particular autonomous system.

Sequence Number
Send state variable (commands) or receive state variable (responses and indications

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

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