Todos los artículos por keithcroxford
It’s been a while since my last update. Having another kid definitely limits the time to create a post, however she is sleeping right now. I’m sitting here with a Red Bull in one hand and a Secure CRT window open and ready to go. Occasionally in the carrier world, your network might be blasted […]
MásI like to have Palladion execute scripts overnight and email the results in a CSV. The issue that I faced was that scripts require you to enter a start and end time. Logging in at 10pm to execute a post dial delay script was not an efficient use of my personal time. I built the […]
MásPalladion is a nice SIP analyzer from IPTEGO. IPTEGO was recently purchased by Acmepacket… so they must be doing something right! Anyways… here are a few “gotcha’s” that I have noticed while working on extension scripts . 1. If you are trying to compare the time stamps between “Leg.setup_start_ts” and “Message.ts” it becomes tricky. SIP […]
MásEvery time I hear “Sham-Link” I can’t help but to think of Vince Shlomi. Maybe he couldn’t make the backdoor link less preferred for CE to CE traffic . Maybe that is what drove him to attack his “date”. Anyways… In a service provider network your customer might have a backdoor link from CE to CE that […]
MásI hate waiting for Wireshark to load a 20+meg capture file to review RTP streams. Once it loads you browse to “Telephony > RTP > Show All Streams”. Then you wait for it analyze the RTP streams….. If you have a fair amount of memory it might not be too horrible of a wait, but it can […]
MásI’ve been using a lot of Wireshark display filters lately. When troubleshooting a 100MB capture file setting a filter to search for relevant data is a huge time saver. Below are some of the common filters that I use. 1. Searching for RTP Packets within a specified range that DO NOT have the DSCP field […]
MásSince implementing new monitoring tools I’ve noticed a lot of failed REGISTER events on our network. Our SBC would issue a 4XX back to the originating UA, however the attempts continue. At one point I saw 200 register messages per second from a single IP. I started to look a bit deeper into the REGISTER […]
MásI recently had to create a configuration that contained multiple VRFs that all NAT/PAT out the same ISP connection. There is also a managed circuit that connects back to the Managed Service Provider (MSP) for management. All dynamic routing configs will need to be placed in the global routing table (default vrf). For this example, […]
MásOften a phone call (or data stream) can span multiple capture files. This is especially true when setting a small file size in your CLI capture syntax. Mergecap will allow you to merge multiple files into one. Assuming that mergecap is in your PATH, you can execute the following: mergecap -w OUTPUTFILE .pcap inputfile1.pcap inputfile2.pcap […]
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