Building anycasted highly-available recursive DNS with dnsdist load balancers and exabgp: using BGP MED-based failover across 4 dnsdist nodes with PowerDNS recursor backends, custom orderedwrandom load balancing policy, and automated healthchecks for route withdrawal.
Logging continuous ping latency and packet loss for troubleshooting using fping -D -l flags: capturing unix timestamps with latency measurements, converting timestamps with Perl, and logging output to file for later analysis.
Configuring IPv6 first-hop redundancy with MikroTik VRRPv3: troubleshooting Router Advertisement issues where IPv6 sessions died during failover, solving by disabling RA on VLAN interfaces and configuring IPv6 ND settings for proper virtual gateway operation.
Implementing RFC 7999 BGP BLACKHOLE community (65535:666) on MikroTik RouterOS: configuring routing filters to set blackhole route type, integrating with FastNetMon for automated DDoS mitigation, and handling provider-specific communities for upstream blackholing.
Large BGP Community draft RFC addressing 32-bit ASN limitations in standard BGP communities: tracking implementation status across ExaBGP, Cisco IOS XR, Nokia SR-OS, and Bird, with development on Github.
