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Update Cloudflare DNS entry
When a system is behind a NAT device that also has a dynamic WAN IP address, it may be necessary to dynamically update a DNS entry on your DNS server. This article shows how to do it by using a simple bash script.
1 min readBPDU filter on a Unifi switch
Brand new Unifi Switch (48 POE-500W) is experiencing some issues that do not affect the switch functionality, but it is filling our syslog server with messages like this: US48P500,18e829286ff3,v4.0.80.10875 switch: DOT1S: dot1sBpduReceive(): Discarding the BPDU on port 0/1, since it is an invalid
2 min readIPv6 stack on Ubuntu/Debian Linux systems
In this article we will explain how to enable or disable IPv6 stack on Ubuntu/Debian systems. Step-by-step guide IPv6 stack state configuration Following parameters are used to control the IPv6 stack: net.ipv6.conf.all.disable_ipv6 net.ipv6.conf.default.disable_ipv6 net.ipv6.conf.[network_
1 min readConfigure StackWise Virtual on Cisco 9500
StackWise Virtual is a Cisco proprietary technology that we use on their newer high-end switches to enable stacking. In the past we had to use special Cisco stacking cables to enable stacking. With the newer Cisco models, we can achieve pretty much the same functionality through SWV. As per Cis
1 min readConfigure portchannel on Cisco 9500
Portchannel is Cisco’s implementation of the EtherChannel technology, (usually) based on the 802.3ad standard). Step-by-step guide Portchannel configuration To configure portchannel on Cisco 9500, first create a portchannel interface: ! interface Port-channel1 description *** Port-Chan
1 min read