Cisco Expressway DNS and Ports

Today I was working with a client who was facing some MRA issues for their 8841 handsets and Jabber. I’ve found that typically the issues are around certificates, but this client’s MRA worked sporadically. I pondered this for a few moments and asked the Network Admin to check the ports on the firewall.. as it turned out, he didn’t have access as this was tightly controlled by security.

As much UC consultants know, network security handled by non-network saavy people, usually turns out to be a complete pain in the ass. No change here. We’ll bulletize the conversation for ease of reading, it starts with me.

  • nmap the IP from the outside
  • what’s nmap?
  • ok telnet to each port on the ip from the outside
  • I can’t find telnet on my machine and I’m not an admin
  • OK I’ll write a script

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PC for my kids

A little background. I have a 7 and 4 year old who like playing on the computer. Typically they play things like animaljam or nickjr games, very simple requirements, minimal hardware needs. One day, the horror that is minecraft crept its way into my home and suddenly, graphics (seriously? in minecraft, it’s a bunch of blocks…) mattered.

At this time there was my old pc with a GTX 460, an SSD, 16G ram, and a nice CPU running windows 10. Beside this system was a Dell Latitude e6510 with a regular 5400 rpm hdd, 4G ram, and a trash cpu running Linux Mint. On minimal graphics settings and fullscreen, minecraft was just almost playable on the laptop, but there was always a fight for the big computer.

Being tired of tracking who was on it last, I tried to think up an idea to resolve this issue while creating a fun project for the kids and I. I came up with a plan to build one system, stick ESXi on it and use pci passthrough to make 2 “thin clients.” The 7 year old would assist in building the PC and the 4 year old would affix the typical stickers that come with systems as she wished. ┬áHere begins the story.

So I began doing some research, obviously there are some requirements such as VT-d and VT-x to properly support pci passthrough. After thorough research on anandtech, toms hardware, and various sites about doing similar projects, I decided that I knew better than all these people and went rogue.

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