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#networking
2 posts
Systems debugging
9 min
Swapping a live router in 50 milliseconds
Two VyOS VMs with identical MACs, a bridge with no ports, host-side tap moves, a seeded DHCP lease, and a dead-man switch. How a home router gets cut to a new release while the house sleeps.
#vyos#networking#proxmox#blue-green
Systems debugging
4 min
One socket for the whole subnet
A host scanner that opened a raw socket and a goroutine per host fell over on anything bigger than a /24. The rewrite uses one socket and two goroutines no matter how many hosts, with an ARP fast path and an unprivileged fallback.
#networking#go#icmp#cli