1、客户端发送CODE_PP_DOMAIN_REQUSET报文给portal服务器，此时可以看到客户端发送给portal是服务器NAT后地址10.217.90.20

[2019-09-20

15:47:02] [DtlCmn] [1250] PortalPkt

Packet Type: [CODE_PP_DOMAIN_REQUEST]Client ---> Server/Bas

Head: Version =

0x2(Portal); HeadType = 0x6e; AuthType = 0; Rsvd = 0; SeriOno= 6085; ReqId =

0; UserIP = 10.222.22.71; UserPort = 0; ErrCode = 0; AttrNum = 2;

EX_ATTR_PRIVATE_IP_ADDRESS

= 10.222.22.71;

EX_ATTR_PUBLIC_IP_ADDRESS

= 10.222.22.71;

[2019-09-20

15:47:02] [Dbg] [1250] Portal sendAndReceivePkt: PKT to 10.217.90.20 and 50200. TimeOut is 5000

2、portal服务器回应CODE_PP_DOMAIN_RESPONES报文给客户端，注意此时在回应此报文时，报文使用EX_ATTR_PORTAL_SERVER_ADDR携带了portal服务器的真实的IP地址10.49.66.140。

[2019-09-20 15:47:02] [DtlCmn] [1250]

PortalPkt

Packet Type:

[CODE_PP_DOMAIN_RESPONES]Client

Head: Version =

0x2(Portal); HeadType = 0x6f; AuthType = 1; Rsvd = 0; SeriOno= 6085; ReqId0 =

0; ReqId1 = 0; UserIP = 10.222.22.71; UserPort = 0; ErrCode = 0; AttrNum = 26;

Attributes:

EX_ATTR_USER_ID = 8996123784895677117;

EX_ATTR_PORTAL_VERSION

= 2;

EX_ATTR_PROTOCAL_TYPE

= http;

EX_ATTR_LOGIN_LANGUAGE

= Dynamic;

EX_ATTR_NEED_NAME

= 1;

=

EX_ATTR_NAT_TYPE =

0

EX_ATTR_HANDSHAKE_DELAY

= 0;

EX_ATTR_HANDSHAKE_OVERTIME

= 9223372036854775807;

EX_ATTR_LOGIN_TIMEOUT

= 4000;

EX_ATTR_LOGOUT_TIMEOUT

= 8000;

EX_ATTR_DHCP_DELAY

= 3000;

EX_ATTR_DHCP_TIMES

= 3;

EX_ATTR_DEVICE_IP2FLAG

= 0;

EX_ATTR_PORTAL_SERVER_ADDR = 10.49.66.170;

EX_ATTR_PORTAL_SERVER_PORT

= 50200;

EX_ATTR_SERVER_TYPE_ID

= ZWWW,HLW;

EX_ATTR_SERVER_TYPE_DESC

= zwww,hlw;

EX_ATTR_ENCRYPT_FLAG

= 1;

3、客户端发送CODE_PP_LOGIN_REQUEST报文给PORTAL服务器，注意此时发送给的PORTAL服务器的IP地址是NAT前的IP地址(真实PORTAL服务器的IP地址)10.49.66.170,此IP地址就是从上个报文中携带过来的，可以看到发送此报文给PORTAL服务器的真实IP地址后，实际网络是不通的，PORTAL服务器一直没有回应此报文，导致认证失败。

[2019-09-20

15:47:02] [DtlCmn] [1250] PortalPkt

Packet Type: [CODE_PP_LOGIN_REQUEST]Client ---> Server/Bas

Head: Version =

0x2(Portal); HeadType = 0x64; AuthType = 1; Rsvd = 0; SeriOno= 6085; ReqId =

0; UserIP = 10.222.22.71; UserPort = 0; ErrCode = 0; AttrNum = 7;

[2019-09-20 15:47:03] [Dbg] [1250] Portal

sendAndReceivePkt: PKT to 10.49.66.170 and 50200. TimeOut is 4000

[2019-09-20 15:47:07] [Err] [1250] Portal

sendAndReceivePkt: recvfrom packets failed, ErrCode is: 10060.

[2019-09-20

15:47:07] [Err] [1250] Portal sendAndReceivePkt:An error occured while sending or receiving

packet.

[2019-09-20

15:47:07] [Err] [1250] Portal authentiction: Failed to send/receive a packet type=

CODE_PP_LOGIN_REQUEST

4、此时web界面认证是正常的，抓取此时终端和PORTAL服务器的交互报文，认证报文如下，可以看到整个认证报文，都是和NAT后的PORTAL服务器IP=10.217.90.20交互报文，这个IP对于客户端而言是可达的，所以报文交互正常，没有出现认证失败的问题。