Configuring RSA public key authentication on Cisco IOS 15 switches/routers: using ip ssh pubkey-chain for passwordless SSH, handling 254-character line length limits on 2960/3560 platforms, and enforcing SSHv2.
Understanding Bandwidth Delay Product and Long Fat Networks: how RTT and TCP receive window size limit per-thread throughput, why download managers use multiple connections, and how TCP window auto-scaling optimizes performance.
Implementing IPv6 Unique Local Addresses (RFC4193) with OpenBSD NAT66: generating fd00::/8 ULA prefixes, translating to public IPs, and workarounds for single /64 provider limitations or private VPS networks.
Tracking dramatic Manitoba ASN growth in 2013-2014: IXP launches (MBIX/WpgIX) drive half of 60+ ASNs to peer locally, exchanging ~1 Gbps traffic and improving rural ISP access to universities over major providers.
