Author: david.mcken
Date: 2022-06-07
Problem definition: As an ISP multiple services are run to offer to customers (DNS, NTP, etc.). A simple docker compose of this is available at https://github.com/dmcken/docker-composer-templates/blob/main/dns-ntp/docker-compose.yml. We have multiple PoPs and usually anycast these addresses throughout the network to spread load / provide redundancy. The anycasting monitoring can be done via custom scripts (ExaBGP, FRR) … Read More
Author: david.mcken
Date: 2021-05-02
Problem definition: We need to define routing policies for filtering received from BGP peers for our Juniper routers. Most ISPs publish their prefixes and routing policies via IRRs. We can use bgpq4 to read this information and produce the config snippets. Lets try for Google IPv4: Now lets repeat for IPv6: Now lets go load … Read More
Author: david.mcken
Date: 2021-03-14
Problem definition: You have a device with the wrong gateway set on it and its a bit far to just walk up to it and login to fix. This assumes you can’t temporarily get a device to act like the gateway and other tricks don’t work. So if from your router you can ping the … Read More
Author: david.mcken
Date: 2020-06-20
To set the iDRAC hostname you usually need to reboot and go into the BIOS to update the hostname. This is somewhat annoying and can be avoided using IPMI on linux (in the command I use the default iDRAC username and password, update accordingly)
Author: david.mcken
Date: 2020-06-18
Problem definition: I got some new drives to which I saw little issue until firing it up and attempting to use I get large blocks of errors in the kernel log similar to the following: My scenario is Hitachi HUC109060CSS601 (S.M.A.R.T. info below) what specifically seems to be the problem is the line “8 bytes … Read More