Due to ongoing peering wars between several Tier-1 providers in IPv6, they are not all connected to each other. At least two pairs of providers decided to “de-peer” in IPv6: Cogent (AS174) and Hurricane Electric (AS6939); Deutsche Telekom (AS3320) and Verizon US (AS701). These telecoms may have different reasons for their conflicts, but if a network is connected only to one party in the conflict, it would not have full IPv6 connectivity. It also affects the reliability of ISP’s with multiple upstream providers — the outage of one may lead to connectivity problems.