On-prem servers must deal with different challenges that Cloud providers magically take care of and […]
IPTables Cheat Sheet
IPTables uses the filter to act as a firewall but also controls the routing of […]
AAA RADIUS AAA TACACS+ on Cisco Devices
Connection your Cisco routers and switches to the AAA RADIUS server. AAA stands for Authentication, […]
SNMP and SYSLOG on Cisco Devices
Enabling SNMPv2c on a Cisco Router, for example. enable configure terminal snmp-server community PASSWORD_STRING ro […]
Port-Secutiry on Cisco Devices
Showing the current configuration before starting: do show vlan brief do show mac address-table do […]
RIPng (IPv6) on Cisco Devices
Just go the all the routers that are directly connected and in each interface enable […]
Local SPAN and Remote SPAN on Cisco Devices
SPAN (Switch Port Analyzer) is a functionality that mirrors one or more ports or VLANs into […]
Spanning Tree Protocol (STP) on Cisco Devices
Types: STP Standard PVST+ (STP per VLAN – by Cisco) RSTP (STP faster) Rapid PVST+ […]
NetMask and WildCard Table
Reference Table for Subnetting Slash Netmask Wildcard Mask /32 255.255.255.255 0.0.0.0 /31 255.255.255.254 0.0.0.1 /30 […]
High Availability with CARP and VRRP
CARP (Common Address Redundancy Protocol) is an alternative protocol to VRRP (Virtual Router Redundancy Protocol), […]