Howto Virtual Routing and Forwarding Lite (VRF-lite)

Introduction VRF-lite is a feature that enables a service provider to support two or more VPNs, where IP addresses can be overlapped among the VPNs. VRF-lite uses input interfaces to distinguish routes for different VPNs and forms virtual packet-forwarding tables by a…

Howto HSRP in a Multihomed BGP

Introduction What is Multi-homing ? Multi-homing means having multiple connections to the Internet. What is HSRP? Hot Standby Router Protocol HSRP allows routers use a shared IP or Virtual IP that act as a single virtual router, maintaining connectivity even if the fi…

Cisco WCCP2 with Squid Proxy and SquidGuard

There are a number of good reasons for deploying proxies at work or at home Restricting web access for specific sites Reduce traffic volumes Monitoring and Managing bandwidth Optionally restrict when someone can surf the web Many more While searching the Internet for s…

Basic Access Control List (ACL) On ASA

How to permit traffic to servers behind a Cisco ASA device. Web Server 192.168.100.80 Email Server 192.168.100.25 DNS Server 192.168.100.53 access-list ServerAccess permit tcp any host 192.168.100.25 eq 25 access-list ServerAccess permit udp any host 192.168.100.53 e…

Avoiding fragmentation: How to find the path MTU

When a packet is traversing a network and encounters a segment that has an Maximum Transmission Unit MTU smaller than the size of the packet, the packet will be fragmented into two or more packets, each with its own IP header. This creates inefficiencies in the network…