孔凡安,堆叠场景下NGFW开启会话同步功能后会话不一致问题

1683807125,

组网及说明

不涉及

告警信息

不涉及

问题描述

某局点两台NGFW堆叠主备部署，下行为Reth接口，上行为二层跨框聚合配置最大选中数，业务实际是主备部署。

运行过程中发现主备设备会话数目不一致，差别较大。

设备也已经开启了会话同步功能。

[H3C-F1000-AK135]disp se sta su
Slot Sessions  TCP       UDP       Rate      TCP rate  UDP rate
1    146718    142107    4545      4816/s    4718/s    95/s    
2    148       85        35        33/s      29/s      1/s    #
 session synchronization enable
 session synchronization dns http
#

过程分析

查看slot 2的会话，备份的会话基本都是一些本地发出或者到本机的会话。

<H3C-F1000-AK135>disp session ta ipv4 sl 2 ver
Slot 2:
Initiator:
  Source      IP/port: 221.12.166.112/6606
  Destination IP/port: 221.12.1.227/2048
  DS-Lite tunnel peer: -
  VPN instance/VLAN ID/Inline ID: -/-/-
  Protocol: ICMP(1)
  Inbound interface: InLoopBack0
  Source security zone: Local
Responder:
  Source      IP/port: 221.12.1.227/6606
  Destination IP/port: 221.12.166.112/0
  DS-Lite tunnel peer: -
  VPN instance/VLAN ID/Inline ID: -/-/-
  Protocol: ICMP(1)
  Inbound interface: Vlan-interface4012
  Source security zone: Untrust
State: INACTIVE
Application: ICMP
Rule ID: 3
Rule name: 1
Start time: 2023-05-02 11:58:32  TTL: 212s
Initiator->Responder:            0 packets          0 bytes
Responder->Initiator:            0 packets          0 bytes
 
Initiator:
  Source      IP/port: 113.12.181.168/9356
  Destination IP/port: 115.221.240.66/57413
  DS-Lite tunnel peer: -
  VPN instance/VLAN ID/Inline ID: -/-/-
  Protocol: UDP(17)
  Inbound interface: Dialer1
  Source security zone: Untrust
Responder:
  Source      IP/port: 115.221.240.66/57413
  Destination IP/port: 113.12.181.168/9356
  DS-Lite tunnel peer: -
  VPN instance/VLAN ID/Inline ID: -/-/-
  Protocol: UDP(17)
  Inbound interface: InLoopBack0
  Source security zone: Local
State: INACTIVE
Application: GENERAL_UDP
Rule ID: 4
Rule name: 2
Start time: 2023-05-06 15:04:48  TTL: 276s
Initiator->Responder:            0 packets          0 bytes
Responder->Initiator:            0 packets          0 bytes
 
Initiator:
  Source      IP/port: 183.167.205.250/52803
  Destination IP/port: 115.221.240.66/26881
  DS-Lite tunnel peer: -
  VPN instance/VLAN ID/Inline ID: -/-/-
  Protocol: TCP(6)
  Inbound interface: Dialer1
  Source security zone: Untrust
Responder:
  Source      IP/port: 115.221.240.66/26881
  Destination IP/port: 183.167.205.250/52803
  DS-Lite tunnel peer: -
  VPN instance/VLAN ID/Inline ID: -/-/-
  Protocol: TCP(6)
  Inbound interface: InLoopBack0
  Source security zone: Local
State: INACTIVE
Application: GENERAL_TCP
Rule ID: 4
Rule name: 2
Start time: 2023-05-06 15:05:09  TTL: 298s
Initiator->Responder:            0 packets          0 bytes
Responder->Initiator:            0 packets          0 bytes
 
Initiator:
  Source      IP/port: 49.234.25.245/49399
  Destination IP/port: 115.221.240.66/1234
  DS-Lite tunnel peer: -
  VPN instance/VLAN ID/Inline ID: -/-/-
  Protocol: UDP(17)
  Inbound interface: Dialer1
  Source security zone: Untrust
Responder:
  Source      IP/port: 115.221.240.66/1234
  Destination IP/port: 49.234.25.245/49399
  DS-Lite tunnel peer: -
  VPN instance/VLAN ID/Inline ID: -/-/-
  Protocol: UDP(17)
  Inbound interface: InLoopBack0
  Source security zone: Local
State: INACTIVE
Application: GENERAL_UDP
Rule ID: 4
Rule name: 2  
Start time: 2023-05-06 15:04:47  TTL: 276s
Initiator->Responder:            0 packets          0 bytes
Responder->Initiator:            0 packets          0 bytes

对比 slot1大部分都是转发的报文。

<H3C-F1000-AK135>disp session ta ipv4 ver
Slot 1:
Initiator:
  Source      IP/port: 192.168.20.124/57721
  Destination IP/port: 192.168.200.57/8080
  DS-Lite tunnel peer: -
  VPN instance/VLAN ID/Inline ID: -/-/-
  Protocol: TCP(6)
  Inbound interface: Reth12
  Source security zone: Trust
Responder:
  Source      IP/port: 192.168.200.57/8080
  Destination IP/port: 115.221.240.66/8104
  DS-Lite tunnel peer: -
  VPN instance/VLAN ID/Inline ID: -/-/-
  Protocol: TCP(6)
  Inbound interface: Dialer1
  Source security zone: Untrust
State: TCP_SYN_SENT
Application: GENERAL_TCP
Rule ID: 1
Rule name: trust_untrsut
Start time: 2023-05-06 15:07:57  TTL: 20s
Initiator->Responder:            2 packets        104 bytes
Responder->Initiator:            0 packets          0 bytes
 
Initiator:
  Source      IP/port: 172.18.15.104/59664
  Destination IP/port: 192.168.200.56/8080
  DS-Lite tunnel peer: -
  VPN instance/VLAN ID/Inline ID: -/-/-
  Protocol: TCP(6)
  Inbound interface: Reth12
  Source security zone: Trust
Responder:
  Source      IP/port: 192.168.200.56/8080
  Destination IP/port: 115.221.240.66/42532
  DS-Lite tunnel peer: -
  VPN instance/VLAN ID/Inline ID: -/-/-
  Protocol: TCP(6)
  Inbound interface: Dialer1
  Source security zone: Untrust
State: TCP_SYN_SENT
Application: GENERAL_TCP
Rule ID: 1
Rule name: trust_untrsut
Start time: 2023-05-06 15:07:45  TTL: 7s
Initiator->Responder:            1 packets         52 bytes
Responder->Initiator:            0 packets          0 bytes
 
Initiator:
  Source      IP/port: 192.168.30.183/53390
  Destination IP/port: 17.3.92.215/445
  DS-Lite tunnel peer: -
  VPN instance/VLAN ID/Inline ID: -/-/-
  Protocol: TCP(6)
  Inbound interface: Reth12
  Source security zone: Trust
Responder:
  Source      IP/port: 17.3.92.215/445
  Destination IP/port: 192.168.30.183/53390
  DS-Lite tunnel peer: -
  VPN instance/VLAN ID/Inline ID: -/-/-
  Protocol: TCP(6)
  Inbound interface: Vlan-interface4012
  Source security zone: Untrust
State: TCP_SYN_SENT
Application: MICROSOFT-DS
Rule ID: 1
Rule name: trust_untrsut
Start time: 2023-05-06 15:07:52  TTL: 14s
Initiator->Responder:            1 packets         48 bytes
Responder->Initiator:            0 packets          0 bytes

进一步查看设备配置，发现现场配置了出链路负载均衡功能，转发的流量都要走LLB的流程。

#
virtual-server ##defaultvsforllbipv4##%%autocreatedbyweb%% type link-ip
 virtual ip address 0.0.0.0 0
 lb-policy ##defaultpolicyforllbipv4##%%autocreatedbyweb%%
 service enable
 bandwidth interface statistics enable
#

虚服务器默认不备份会话

解决方法

开启虚服务器的会话扩展信息备份功能

connection-sync   enable命令用来开启虚服务器的会话扩展信息备份功能。
undo   connection-sync   enable命令用来关闭虚服务器的会话扩展信息备份功能。
【命令】
connection-sync   enable
undo   connection-sync   enable
【缺省情况】
虚服务器的会话扩展信息备份功能处于关闭状态。
【视图】
虚服务器视图
【缺省用户角色】
network-admin
mdc-admin
vsys-admin
【使用指导】
HTTP类型的虚服务器不支持本命令。
【举例】
# 开启 IP类型的虚服务器 vs3的会话扩展信息备份功能。
<Sysname>system-view
[ Sysname ]  virtual-server vs3 type ip
[ Sysname-vs-ip-vs3 ]  connection-sync enable内容来源：知了社区，基于知识共享署名-相同方式共享3.0中国大陆许可协议
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