Q&A: How to Troubleshoot ASA, PIX, and FWSM?

In this article we collected the answers for the questions on the Topic-Troubleshooting ASA, PIX, and FWSM. Note: It was provided by Kureli Sankar, which is available in the Ask The Expert section of Cisco Support Community. Q&A: How to Troubleshoot ASA, PIX, and…
DHCP Option 150 & DHCP Option 66

Here we will provide an understanding for configuring option 150 and to use option 66 for EX Switches. DHCP Option 150 is Cisco proprietary. Option 66 is an IEEE standard. PROBLEM OR GOAL: Solution: For Cisco phones IP addresses can…
FAQ: What Network Users Care about IPv6?

This article contains Frequently Asked Questions (FAQ’s) about Internet Protocol Version 6(IPv6). Q. How to limit clients getting an  IPv6 address without using a DHCP server ? A. Use the command“ipv6nd prefix <prefix> no-advertise”.This will set a bit in theIPv6 NA…
Five Things You Should Know About DHCP Snooping

DHCP snooping allows the switch to monitor and control DHCP messages received from untrusted devices connected to the switch. When DHCP snooping is enabled, the system builds and maintains a database of valid IP-address/MAC-address (IP-MAC) bindings called the DHCP snooping…

DHCP snooping is a security feature intended to prevent rogue DHCP server from sending malicious DHCP replies. When DHCP snooping is enabled, the switch intercept all the DHCP requests, and discards DHCP replies coming from “untrusted” ports. The offending switch…
DHCP & DHCP Operation

DHCP (Dynamic Host Configuration Protocol) works in a client/server mode. DHCP enables clients on an IP network to obtain or lease IP address or configuration from a DHCP server. This reduces workload when managing a large network. DHCP protocol is…