natRules.Write("-X", chainString)                  // delete
			}
		}
		// Hunt for service and endpoint chains.
		for chain := range existingNATChains {
			chainString := string(chain)
			if isServiceChainName(chainString) {
				natChains.Write(utiliptables.MakeChainLine(chain)) // flush
				natRules.Write("-X", chainString)                  // delete
			}
		}
		natRules.Write("COMMIT")

	// length of 252, well over chainNameBaseLengthMax (240), so truncation is
	// theoretically possible (though incredibly unlikely).
	return hashAndTruncate(name)
}

func isServiceChainName(chainString string) bool {
	// The chains returned from servicePortChainNameBase and
	// servicePortEndpointChainNameBase will always have at least one "/" in them.