Category: Networking
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Add Secondary IP Address to Centos Interface
This is super simple, just create a new interface file with a colon and a number. /etc/sysconfig/network-scripts/ifcfg-eth0:1 DEVICE=eth0:1 BOOTPROTO=static IPADDR=192.168.0.5 ONBOOT=yes
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Cisco ATA 186 Setting Static VLAN – Tool to Calculate VLAN Value
If you are going to setup an ATA in a network that is non Cisco(sans voice vlan on switches), then you will need to manually configure your ATA to support the Voice VLAN. The easiest way is to let you ATA pull DHCP and configure it via the web interface: http://192.168.1.100/dev If you want to…
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ASA Crypto Map Ordering
A friend of mine was telling me about an ASA issue he was having. His LAN-to-LAN tunnels would establish and cause intermittent connectivity issues. He would be able to only get to some subnets on either side of the tunnel. It wasn’t always the same subnets, nor would it always happen. His ACLs were the…
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Use Asterisk as an SRST (Survivable Remote Site Telephony) Gateway with Cisco CallManager
What is this and why do I need it? Here’s the scenario. You have a central office with five remote offices. You run Cisco CallManager at the central office and you simply deploy phones out at the remotes to use the central Callmanager. This saves you money by using a single call server. Now imagine…
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Ubiquiti 3.65 Ghz Cards
I noticed that Ubiquiti now has some 3.65 cards. This sounds like a great idea for backbone links in some congested 2.4 or 5.8 areas. The only real downside I can see is that the price for the card is ~$250 and the range must be licensed in some areas. Any of you guys running…
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IPPlan and RWhois Integration Script
Pull all of your records from IPPlan and insert them into your RWhois server automatically. If you are an ISP or large enterprise you will need to keep up with your addressing and assignments somehow, right? There are only a handful of products out there that will do this. The company I work for is…
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Hidden Internal VLANs on a Cisco 6500
Something interesting about a Cisco 6500 is that it uses hidden internal VLANs. Most people will never be aware of this because the assignment starts in the extended VLAN range. An internal VLAN is created for every port in your chassis that is not an access port. The command to view these VLANs is “show…