BGP Regular Expressions Character Function . Match any single character \ Match the following character [ ] Match the characters or a range of characters separated by a hyphen ^ Beginning of an input string $ End of an input string ? Match zero or one occurrence * Match zero or more sequences …
Category Archive: Resources
Bogons
What are Bogons? Bogons are address space or netblocks that have not been allocated by IANA and you should never see from the Internet. Address space such as RFC1918, RFC5735 and RFC6598. Refer to this website for more information: http://www.team-cymru.org/bogon-reference.html Address space to include as Bogons: 0.0.0.0 255.0.0.0 10.0.0.0 255.0.0.0 100.64.0.0 255.192.0.0 127.0.0.0 255.0.0.0 169.254.0.0 255.255.0.0 …
Timers
1 Second Default VRRP hello timer Default Group Specific Query interval (Maximum Response Time of 10) for IGMPv2 2 Seconds Default IEEE 802.1D STP hello timer Default IGMPv2 Last Member Query Count x 2 3 Seconds Default GLBP hello timer (Cisco IOS) Default HSRP hello timer (Cisco IOS) 5 Seconds Default EIGRP hello timer on …
May 22
TCL Script: Ping
Difficulty Rating: Practical use case: To see what has connectivity in the network Scenario: IGP and EGP routing protocols have converged and are stable. You now want to perform end-to-end connectivity testing to check for faults using ping (or traceroute) Instructions: On each device run the command #show ip alias. This will …
TCL Scripts
For those that don’t know, TCL (pronounced Tickle) is a method of creating and running scripts on Cisco devices, mainly routers and switches. These can range to do anything from configuring device components to pinging remote addresses. To write a script you need to go into the TCL Shell on a device, accessed from Priv EXEC …
IP Protocol Numbers
The below table lists common IP protocols and their well-known numbers. The authoritave list can be found on the IANA website here Protocol Number Protocol 1 ICMP 2 IGMP 6 TCP 17 UDP 41 IPv6 in IP Tunnel 47 GRE 50 ESP 51 AH 88 EIGRP 89 OSPF 103 PIM 112 VRRP 115 L2TP