While using Ansible 2.4.3 for the very first time after upgrading, I received the following error: [DEPRECATION WARNING]: [defaults]hostfile option, The key is misleading as it can also be a list of hosts, a directory or a list of paths . This feature will be … “Ansible hostfile Deprecated”
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# clsh tmsh show sys hardware | grep ‘Host Board Serial’ The above command is run from bash shell on the F5 in order to identify the serial number of all the blades in an F5 Viprion device. # tmsh show sys hardware | grep … “Serial Number – Viprion Blades and Chassis”
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You can follow SOL13151 in order to increase the packets/sec value. However, I would caution against doing it or at least recommend keeping the value smaller. The default setting is in place to prevent the F5 from overwhelming its resources by sending out RST. This could potentially … “F5 – RST or ICMP Packet Rate”
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F5 utilizes iControl REST API as part of their automation toolkit. REST API is a powerful way to automate F5 management. iControl REST API was introduced by F5 in 11.5 code version. 11.6 code version is the first major code version with a relatively stable … “F5 iControl REST”
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These are a few quick checks as part of the GTM code upgrade maintenance that will be useful. As part of the maintenance preparatory work, check the license “service check date” as per K7727 Before starting the code upgrade and after the code upgrade, the … “GTM Code Upgrade”
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This is a short list of commonly available network troubleshooting tools that has been of use to me: Ping. traceroute. nslookup/dig curl. Error logs on the device. tcpdump. Developer tools within a browser like Chrome/FF. Wireshark.
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A simple way to clear the contents of ssh key file without deleting the file: echo -n > /home/user/.ssh/known_hosts
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VTP stands for VLAN Trunk Protocol. VTP is used to propagate VLAN cconfiguration. VTP advertisements are multicasted. They are sent every 5 minutes or whenever there is a change in VLAN configuration. VTP revision number is included in these advertisements. Whenever a client receives a … “Basic VTP”
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This is a simple DHCP configuration on a Layer 3 Switch: SW1(config)# ip dhcp excluded-address 10.10.10.1 SW1(config)# ip dhcp pool VLAN20POOL SW1(dhcp-config)# network 10.10.10.0 255.255.255.0 SW1(dhcp-config)# default-router 10.10.10.1 SW1(dhcp-config)# lease 2 Lease is in hours. Default-router IP indicates the default hop for the 10.10.10.0/24 network. … “Basic DHCP Configuration”
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When a DNS query arrives at a F5 GTM/DNS, this is the processing order for the DNS query. 1 – DNS Query is processed by the Listener. 2- If Recursion Desired (RD) flag is set in the incoming query and if the DNS Profile associated … “F5 GTM – DNS Query Processing Order”
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