Microsoft Exchange Server Build Numbers
Jul03

Microsoft Exchange Server Build Numbers

Exchange Server Build Numbers KB ID 0000344 Problem To find out what service pack and rollups have been applied to Microsoft Exchange you need to locate its “Build Number”. 2000/2003 2007 2010 Warning: After SP3 the build number does not update. To find your build number in Exchange 2010 (after SP3,) use the following command; exsetup | %{$_Fileversioninfo} 2019, 2016, and 2013 Find Exchange 2019 / 2016 and 2013 Build...

Read More
Cisco Simple GRE with IPSEC Tunnels
Jul01

Cisco Simple GRE with IPSEC Tunnels

 GRE with IPSEC KB ID 0000951 Problem I’ve spent years setting up VPN tunnels between firewalls. The only time I’ve ever dealt with GRE is for letting VPN client software though firewalls. GRE’s job is to ‘encapsulate’ other protocols and transport those protocols inside a virtual point to point link. Below is the topology, I’m going to use. The tunnel will run form Router R1 to Router R3, once...

Read More
VMware Workstation – ‘Linked Clones’ from Templates
Jun05

VMware Workstation – ‘Linked Clones’ from Templates

 Linked Clones KB ID 0000953  Problem VMware Workstation, is a great test tool, if i need to take a look at some new software, or plan how I’m going to do a job, and I don’t have access to the ESX server, or test bench, it’s a great tool to have on my laptop. If you build machines form scratch, every time you need one it can take a while. To address that you can create a template and deploy machines from that. To...

Read More
Cisco – Configuring Dynamic Multipoint Virtual Private Networks DMVPN
May30

Cisco – Configuring Dynamic Multipoint Virtual Private Networks DMVPN

DMVPN KB ID 0000954 Problem A while back I uploaded a run through on how to deploy GRE tunnels and protect those tunnels with IPsec. That point-to-point GRE tunnel is a good solution, but if you have a lot of sites it’s not a solution that scales very well. Yes you can have 2147483647 tunnel interfaces, but good luck manually configuring all those tunnels and even if you did, if you want each of your remote sites to talk to each...

Read More
Implementing GDOI into DMVPN
May29

Implementing GDOI into DMVPN

GDOI into DMVPN KB ID 0000956  Problem Just recently I covered DMVPN, which is a great scalable system for adding new sites to your network infrastructure and have them join an existing VPN solution without the need to add extra config at the ‘hub’ site. One of the advantages of DMVPN is it maintains VPN connections from your ‘Spoke’ sites back to the ‘Hub’ site, but if a spoke site needs to speak...

Read More