How to Analyze Network Protocols, Learn More >>

Being able to support more than 300 protocols in the latest version, Capsa Network Sniffer make it easy to analyze protocols in network and understand what is happening.

Recommend Network Analysis Software >>


RFC 1613 http://tools.ietf.org/html/rfc1613

XOT is Cisco Systems X.25 over TCP.
(Compliant with IETF RFC1613).

It is sometimes desirable to transport X.25 over IP internets. The X.25 Packet Level requires a reliable link level below it and normally uses LAPB. This memo documents a method of sending X.25 packets over IP internets by encapsulating the X.25 Packet Level in TCP packets.

TCP provides a reliable byte stream. X.25 requires that the layer below it provide message semantics, in particular the boundary between packets. To provide this, a small (4-byte) XOT header is used between TCP and X.25. The primary content of this header is a

length field, which is used to separate the X.25 packets within the TCP stream.

In general, the normal X.25 protocol packet formats and state transition rules apply to the X.25 layer in XOT. Exceptions to this are noted.

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

Version

Length

2 bytes

2 bytes

XOT header structure

Version
The version number.

Length
The length of the packet.

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