What’s wrong with the old Cisco Console Cable? As a long time Network Engineer I’ve used a fair share of Cisco console cables and various dongles. The regular generic Cisco Console cables (aka Rollover cable) that come with routers and…
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Prerequisites Not all Cisco switches support Netflow. Cisco Catalyst 3650 and 3850 runs IOS XE and supports Full Netflow (not sampled) capability. This feature is only supported from IPBASE license and up. In order to enable this, use the below…
The Avaya (formerly Nortel) Ethernet Routing Switch (ERS) has reached end of life and end of sale. The recommended replacement model is the ERS 5900 series switches. Models ERS 5510-24T ERS 5510-48T ERS 5520-24T ERS 5520-48T ERS 5520-24T-PWR ERS 5520-48T-PWR…
Cisco switch management port interface The Cisco management port interface could be located at the back or front of the switch and has a yellow band around it like the picture below: It is a layer 3 (routed) port and…
Problem Are you getting this error message when connecting to a SSH Server from your MACOS? Unable to negotiate with x.x.x.x port 22: no matching key exchange method found. Their offer: diffie-hellman-group1-sha1 Solution Since the upgrade of El Capitan (10.11)…
Authentication Methods Type 1 Authentication: Something you know Passwords Static Passwords – reusable password that may or may not expire. User generated and work best with when combined with other authentication type such as smart card or biometric Passphrase –…
Problem Getting this error message on popup on your Windows 7 PC? Windows has detected an IP address conflict or Duplicate IP Address 0.0.0.0 or The system has detected an address conflict for IP address 0.0.0.0 with the system having…
Network Architecture and Design Network Defense-in-depth Anyone control may fail, so multiple controls are always recommended. Routers, Firewalls, IPS, hostbased protections, Antivirus, patching and user awareness training should all be used in concert so that failure of one control should…
Perimeter Defenses Fences Fences range from 1M to 2.4M with barbed wire on top and should be designed to steer ingress and egress to contolled points such as doors and gates. Gates Gates range from Class I gates (home) deter…
Cornerstone Cryptographic Concepts Cryptology – Science of secure communications. Encompasses both cryptography and cryptoanalysis Cryptography – Creates messages whose meaning is hidden Cryptoanalysis – Science of breaking encrypted messages Cipher – A cryptographic algorithm Plaintext – unencrypted message Encryption –…