ARP Caching and Timeout

February 1st, 2009 Wael Osama Posted in IP Services, TCP/IP 8 Comments »

// < ![CDATA[ google_ad_client = "ca-pub-5272078080280462"; /* upper-left-sq */ google_ad_slot = "5606795637"; google_ad_width = 200; google_ad_height = 200; // ]]> From time to time I find myself craving to the fundamentals; I do this for two main reasons, the first one is that fundamentals are the building blocks of all complex networking topics and deeply [...]

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How-to: Avoid DNS lookup when mistyping a command

August 6th, 2008 Wael Osama Posted in CISCO HOW-TO, IP Services 3 Comments »

If domain lookup is enabled (default) the router treats each mistyped command as a hostname and tries to resolve its IP address by querying the DNS server. This behavior is undesirable in most cases because it wastes network administrators time waiting for routers trying to resolve mistyped commands. R2#xyz Translating “xyz”…domain server (255.255.255.255) Translating “xyz”…domain [...]

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How-TO: Configure DHCP on a CISCO router

July 11th, 2008 Wael Osama Posted in CISCO HOW-TO, IP Services 3 Comments »

This post is about configuring a CISCO router to act as a DHCP server in your network. Task1: Configure R1 to act as a DHCP server and provide all network information to hosts in the LAN dynamically. (R1 and R2 are directly connected via Ethernet) Server Configuration (R1) !– enable dhcp server (default) service dhcp [...]

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