如图所示，两台安全网关的配置分别为：RTA[RTA]ikepeer123[RTA-ike-peer-123]pre-shared-kesimple123[RTA-ike-peer-123]remote-address10.2.1.2[RTA-ike-peer-123]local-address10.2.1.1[RTA-ike-peer-123]quit[RTA]ipsecproposal1[RTA-ipsec-proposal-1]quit[RTA]aclnumber3000[RTA-acl-adv-3000]rule0permitipsource10.1.1.00.255.255.255[RTA]ipsecpolic11isakmp[RTA-ipsec-polic-isakmp-1-1]securitacl3000[RTA-ipsec-polic-isakmp-1-1]ike-peer123[RTA-ipsec-polic-isakmp-1-1]proposal1[RTA-ipsec-polic-isakmp-1-1]quit[RTA]interfaceEthernet0/1/0[RTA-Serial0/2/1]ipaddress10.2.1.1255.255.255.0[RTA]interfaceSerial0/2/1[RTA-Serial0/2/1]ipaddress10.2.1.1255.255.255.0[RTA-Serial0/2/1]]ipsecpolic1RTB：[RTB]ikepeer123[RTB-ike-peer-123]pre-shared-kesimple123[RTB-ike-peer-123]remote-address10.2.1.1[RTB-ike-peer-123]local-address10.2.1.2[RTB-ike-peer-123]quit[RTB]ipsecproposal1[RTB-ipsec-proposal-1]quit[RTB]aclnumber3000[RTB-acl-adv-3000]rule0permitipsource10.3.1.00.255.255.255[RTB]ipsecpolic11isakmp[RTB-ipsec-polic-isakmp-1-1]securitacl3000[RTB-ipsec-polic-isakmp-1-1]ike-peer123[RTB-ipsec-polic-isakmp-1-1]proposal1[RTB-ipsec-polic-isakmp-1-1]quit[RTA]interfaceEthernet0/1/0[RTA-Serial0/2/1]ipaddress10.3.1.1255.255.255.0[RTB]interfaceSerial0/2/1[RTB-Serial0/2/1]ipaddress10.2.1.2255.255.255.0[RTB-Serial0/2/1]ipsecpolic1由此可知()。