The GitHub DDoS attack was due to vulnerability via the common misconfiguration in Memcached servers that unique among amplification class of attacks. Cloudflare says a carefully crafted technique allows an attacker with limited IP spoofing capacity (such as 1Gbps) to launch very large attacks (reaching 100s Gbps) amplifying the attackers bandwidth. Github moved the traffic through Akamai and the attacked mitigated by reconfiguring the Access Control Lists to filter the packets that pass through the router.”]