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Cisco IOS supports multiple IP Addresses on an interface. There will be one Primary IP Address on the interaface and multiple Secondary IP Addresses on the interface. There is no limit on the number of IP Addresses that can be configure on an interface. Configurng multiple IP Addresses on your cisco routers can sometime help where you have multiple subnets having one physical router interface. The IP Addresses can be from different subnets and from different networks.Read More →

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In: IP Tools, Windows
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One of the most important thing that is ignored most of the time while troubleshooting a network problem to a host or a network is checking the MTU related issue. This makes more sense in situations like troubleshooting VPN related issues. MTUROUTE is a small but smart utility that uses ICMP pings of various sizes in order to determine the MTU values (Maximum Transmission Unit) on the path between itself and the target system. MTUROUTE can operate in normal mode where it sends multiple ICMP packets to each hop on the path to identify the smallest MTU between the host and hop or in aRead More →

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In: Cisco
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It is always important that a copy of the config is saved elsewhere on a server to facilitate a speedy recovery should there be a catastrophy. While Cisco Routers and Switches can recover from a crash as long as the running-config is copied to the startup config. There is every reason for it to fail as it did on one of my Catalyst 3750s. There is a lot of automated config backup solutions available for free/opensource. Its worth knowing a manual backup procedure as well.Read More →