Who fought against whom in the Vietnam War?

The Vietnam war was fought between the Communist forces (North Vietnam, Viet Cong, Khmer Rouge, Pathet Lao, People's Republic of China, Soviet Union, and North Korea) and the Anti-Communist forces (South Vietnam, U.S., South Korea, Australia, Philippines, New Zealand, Thailand, Khmer Republic, Kingdom of Laos, and the Republic of China).

Source: Wikipedia