Monthly Archives: August 2015

Performing Ping Sweeps with IOS TclSh

It’s been a while since I’ve gotten a blog post up, but with my CCIE recertification out of the way I’m hoping to ramp some volume back up. We’re talking about some sexy stuff today… Ping sweeps! First off, let’s cover why you’d need to sweep up your pings. Some people use the ping sweep as a means to “find” hosts on the network. The problem with this is, devices with host-based firewalls active may not respond to an ICMP ping. If you’re pinging from off the local subnet, there are other reasons you might not get a response back as well, like a host having a mis-programmed default gateway or subnet mask, or an interface ACL on the routing device. That said, ping sweeps are still incredibly useful for helping to find vacant IP addresses on a LAN. Or, at least, IP addresses that are not currently active. Always consult your properly maintained IP documentation to find IPs you can safely use for new deployments (yes, I’m laughing at that one too…).

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Virtualization, Storage, and other techy stuff

The Stupid Engineer

I ask those questions you're too clever to.

Sunay Tripathi's Blog

Pluribus Networks Founder's Blog on OS, Networking, Virtualization, Cloud Computing, Solaris Architecture, etc

Ed Koehler's Blog

Just another weblog

Data networking, stray thoughts, nerdy fun...

Network Heresy

Tales of the network reformation

The Borg Queen

Jottings on the intersection of tech and humanness

Networking From The Trenches

Ramblings about my thoughts, experiences, and ideas.

Networking 40,000

Attaining my CCIE with the help of Warhammer 40k

Network Shenanigans

Making Packets Do Silly Things

It must be the network...

Ramblings of JD (@subnetwork)

Not Another Network Blog

Musings from yet another IT nerd

rsts11 - Robert Novak on system administration

Resource sharing, time sharing, (20)11 and beyond. A retired sysadmin's blog.