Cisco IOS – DHCP Helper (DHCP Relay) – IP-Helper Setup
KB ID 0001168 Problem Cisco documentation calls this a ‘DHCP Relay’, and uses the command IP-Helper, and I usually call this DHCP Helper, just to confuse everyone. To be fair the term DHCP Relay is an industry standard, it’s not particular to Cisco (as you will see later when I Wireshark the traffic). So If you are reading this you have a DHCP server and you want to use it to lease addresses to clients that are on a...
Cisco IOS – An interface whose trunk encapsulation is “Auto” can not be configured to “trunk” mode.
KB ID0001167 Problem If you try and change a ports status, to make it a trunk port, you may see this error; Petes-Switch(config-if)#switchport mode trunk Command rejected: An interface whose trunk encapsulation is “Auto” can not be configured to “trunk” mode. Trunk Settings I don’t know if this is a throwback to when we had ISL trunking and 802.1q, but you need to specify the encapsulation before you can...
Arcserve – Backup a ‘Mapped Drive / UNC Path”
KB ID 0001165 Problem It’s been such a long time since I touched any backup software, I setup Arcserve UDP this week for a client to backup their servers to a NAS drive, then they wanted to back that data off to tape for an offsite backup. I installed Arcserve no problem, it looks much the same as it did last time I used it. When I expanded the server-name only the local drives were shown, as I only had a basic licence adding...
Re-Image and Update the Cisco FirePOWER Services Module
KB ID 0001164 Problem This takes ages! Seriously, if it’s late in the afternoon you might want to do this tomorrow morning, or leave the re-imaging running overnight. (Remember if you set the FirePOWER module to ‘fail-closed’, you will lose internet access, so you might want to change that to ‘fail-open’ as well). The process is a LOT EASIER to do in the ASDM, I’m not usually an advocate of the GUI,...
Windows Server – Locate CA / Certificate Services
KB ID 0001163 Problem A colleague was having some certificate problems onsite the other week. Someone suggested just using Certificate Services to simplify matters. I said I’d spin it up and configure it for him, (I’ve done a lot of Microsoft CA work, search the site!) My fist question was, “Do they already have certificate services?’, unsurprisingly the answer was “I don’t know”. So if...
Cisco FirePOWER – Update Fails ‘Peer Registration Failed: Registration in Progress’
KB ID 0001162 Problem If you attempt to perform an update on the FirePOWER services module in your firewall, you may see the following error; Error Installation Failed: Peer registration in progress. Please retry in a few moments I found myself in this situation because I’d attempted to register the firewall in the FirePOWER Management Center Appliance, and the process failed, (because the versions were different). So when I...
Cisco Small Business (SG500) Link Aggregation (LAG) With LACP
KB ID 0001277 Problem At work a client was having trouble with a NAS Drive (Buffalo Terastation). It was being used as a backup target and some of the servers were dropping connections. I knew the client had some Catalist 3750’s So I suggested going and creating an Ether Channel to the two NICs in the NAS box, to try and cure the problem. However when I went onsite, I noticed the 3750 didn’t have any spare Gigabit ports...
ASA Setup FirePOWER Services (for ASDM)
KB ID 0001107 Problem Both the 5506-X (rugged version and wireless), and 5508-X now come with a FirePOWER services module inside them. This can be managed from either ASDM* (with OS and ASDM upgraded to the latest version), and via the FireSIGHT management software/appliance. Related Articles, References, Credits, or External Links *UPDATE: All ASA ‘Next-Gen’ firewalls can now have their Firepower Service Module managed...
Audi A6 – Luggage Compartment Fuse Box Location
KB ID 0001161 Problem I know it’s not the usual site content, but PNL was born from my dislike of vendor documentation, and crappy documentation is not limited to the world of IT. The 12v power socket in my A6 wasn’t working, this was probably because there was a 1p coin stuck in it that took a lot of fishing out, I assumed the fuse had blown, and put up with it for a while. When I finally got round to sorting it out...
GNS3 Update – Could Not Find a VM Named ‘GNS3 VM’
KB ID 0001160 Problem GNS3 had nagged me the last few times I tried to use it about upgrading, so I downloaded and installed the update and it stopped here; Could not find a VM named ‘GNS3 VM’ is it imported in VMware or Virtualbox I use both VMware Fusion and Virtualbox. But Virtualbox looks after all the VM’s I use in GNS3. Either way I did not know what I was looking for, and the download (and application folder)...