Skip to main content

ARP & UDP header

 

Acronyms

AH Authentication Header (RFC 2402)

ARP Address Resolution Protocol (RFC 826)

BGP Border Gateway Protocol (RFC 1771)

CWR Congestion Window Reduced (RFC 2481)

DF Do not fragment flag (RFC 791)

DHCP Dynamic Host Configuration Protocol (RFC 2131)

DNS Domain Name System (RFC 1035)

ECN Explicit Congestion Notification (RFC 3168)

ESP Encapsulating Security Payload (RFC 2406)

FTP File Transfer Protocol (RFC 959)

GRE Generic Route Encapsulation (RFC 2784)

HTTP Hypertext Transfer Protocol (RFC 1945)

ICMP Internet Control Message Protocol (RFC 792)

IGMP Internet Group Management Protocol (RFC 2236)

IMAP Internet Message Access Protocol (RFC 2060)

IP Internet Protocol (RFC 791)

ISAKMP Internet Sec. Assoc. & Key Mngm Proto. (RFC 7296)

L2TP Layer 2 Tunneling Protocol (RFC 2661)

OSPF Open Shortest Path First (RFC 1583)

POP3 Post Office Protocol v3 (RFC 1460)

RFC Request for Comments

SMTP Simple Mail Transfer Protocol (RFC 821)

SSH Secure Shell (RFC 4253)

SSL Secure Sockets Layer (RFC 6101)

TCP Transmission Control Protocol (RFC793)

TLS Transport Layer Security (RFC 5246)

TFTP Trivial File Transfer Protocol (RFC 1350)

TOS Type of Service (RFC 2474)

UDP User Datagram Protocol (RFC 768)




UDP Header


UDP Header


Common UDP Ports


7 echo 137 netbios-ns 546 DHCPv6c
19 chargen 138 netbios 547 DHCPv6s
53 domain 161 snmp 1900 SSDP
67 DHCPs 162 snmp-trap 5353 mDNS
68 DHCPc 500 isakmp
69 tftp 514 syslog
123 ntp 520 Rip



Length: number of bytes including UDP header. Minimum value is 8
Checksum includes pseudo-header (IPs, length, protocol), UDP header and payload.


ARP


ARP Header


Hardware Type: 1 - 

Ethernet Protocol Type: 0x0800 - 

IPv4 Address Length: 4=IPv4, 6=Ethernet 

Opcode: 1-request, 2-response


Comments

Post a Comment

Popular posts from this blog

Rectangular Microstrip Patch Antenna

Microstrip is a type of electrical transmission line which can be fabricated using printed circuit board technology, and is used to convey microwave-frequency signals. It consists of a conducting strip separated from a ground plane by a dielectric layer known as the substrate. The most commonly employed microstrip antenna is a rectangular patch which looks like a truncated  microstrip  transmission line. It is approximately of one-half wavelength long. When air is used as the dielectric substrate, the length of the rectangular microstrip antenna is approximately one-half of a free-space  wavelength . As the antenna is loaded with a dielectric as its substrate, the length of the antenna decreases as the relative  dielectric constant  of the substrate increases. The resonant length of the antenna is slightly shorter because of the extended electric "fringing fields" which increase the electrical length of the antenna slightly. An early model of the microst...
Read more

How to Set Up Guest Access on Ruckus ZoneDirector – Step-by-Step Guide

 Are you looking to configure guest access on your Ruckus wireless network? In this blog, we’ll take you through the entire process of setting up secure guest access using Ruckus ZoneDirector. Whether you're an IT admin or a network manager, this guide will help you create a BYOD guest WLAN, set up guest pass authentication, and secure your network with wireless client isolation. Step-by-Step Tutorial Includes: Logging into the Ruckus ZoneDirector controller Configuring Guest Access services for BYOD devices Creating a dedicated guest WLAN Using guest pass authentication for added security Isolating guest devices on the network for better privacy Accessing the guest network from a client device By following this tutorial, you'll be able to provide a seamless and secure experience for visitors connecting to your WiFi network. Check out our video tutorial for a detailed walkthrough! #RuckusZoneDirector #GuestAccess #WiFiSetup #BYOD #WLANConfiguration #WirelessNetwork #NetworkSecu...
Post a Comment
Read more

Cracking Passwords Using John the Ripper: A Complete Step-by-Step Guide

Cracking Passwords Using John the Ripper: A Complete Step-by-Step Guide In today's post, we’re diving into a practical lab exercise that shows how to use John the Ripper, one of the most effective password-cracking tools in cybersecurity. Whether you're an IT professional or a cybersecurity student, mastering John the Ripper will help you understand password vulnerabilities and enhance your penetration testing skills. Lab Objective: The goal of this lab is to crack the root password on a Linux system (Support) and extract the password from a password-protected ZIP file (located on IT-Laptop). Both tasks are performed using John the Ripper. Steps to Crack the Root Password on Support: Open the Terminal on the Support system. Change directories to /usr/share/john . List the files and open password.lst to view common password guesses. Use John the Ripper to crack the root password by running john /etc/shadow . Once cracked, the password is stored in the john.pot file for future u...
Post a Comment
Read more