现场组网拓扑如上图所示。无线控制器的int-vlan1000作为下面无线客户端的网关,防火墙的1/0/2和1/0/3都为trust域,int-vlan100是防火墙的三层接口,作为终端pc的网关,并且int-vlan100也属于trust域,防火墙的1/0/2和1/0/3都是二层接口,放通vlan100。
现场的故障现象为:在ac上直接ping终端地址192.168.2.3可以ping通,但是在ac上带源地址172.16.0.1(vlan-int1000的地址)ping终端地址却不通。
防火墙关键配置:
#
interface Vlan-interface100
ip address 192.168.2.1 255.255.255.0
#
interface GigabitEthernet1/0/2
port link-mode bridge
port access vlan 100
#
interface GigabitEthernet1/0/3
port link-mode bridge
port access vlan 100
#
security-zone name Trust
import interface Vlan-interface100
import interface GigabitEthernet1/0/2 vlan 100 1000
import interface GigabitEthernet1/0/3 vlan 100 1000
#
zone-pair security source Local destination Local
packet-filter 3000
#
zone-pair security source Local destination Trust
packet-filter 3000
#
zone-pair security source Trust destination Local
packet-filter 3000
#
zone-pair security source Trust destination Trust
packet-filter 3000
#
ip route-static 172.16.0.0 16 192.168.2.2
#
acl advanced 3000
rule 0 permit ip
AC上的关键配置
#
interface Vlan-interface100
ip address 192.168.2.2 255.255.255.0
#
interface Vlan-interface1000
ip address 172.16.0.1 255.255.0.0
#
interface GigabitEthernet1/0/1
port link-mode bridge
port access vlan 100
#
ip route-static 0.0.0.0 0 192.168.2.1
查看防火墙上的会话表项
Slot 1:
Initiator:
Source IP/port: 172.16.0.1/223
Destination IP/port: 192.168.2.3/2048
DS-Lite tunnel peer: -
VPN instance/VLAN ID/Inline ID: -/100/-
Protocol: ICMP(1)
Inbound interface: GigabitEthernet1/0/2
Source security zone: Trust
Responder:
Source IP/port: 192.168.2.3/223
Destination IP/port: 172.16.0.1/0
DS-Lite tunnel peer: -
VPN instance/VLAN ID/Inline ID: -/100/-
Protocol: ICMP(1)
Inbound interface: GigabitEthernet1/0/3
Source security zone: Trust
State: ICMP_REQUEST
Application: ICMP
Rule ID: 0
Rule name:
Start time: 2018-11-12 21:13:04 TTL: 47s
Initiator->Responder: 5 packets 510 bytes
Responder->Initiator: 0 packets 0 bytes
Total sessions found: 1
发现发起方向的会话正常,有5个包,但是回包为0个。
查看debug aspf packet acl发现有提示报错
*Nov 12 16:46:40:581 2018 FW ASPF/7/PACKET: The first packet was dropped by ASPF for invalid status. Src-ZOne=Trust, Dst-ZOne=Trust;If-In=Vlan-interface100(30), If-Out=Vlan-interface100(30); Packet Info:Src-IP=192.168.2.3, Dst-IP=172.16.0.1, VPN-Instance=none,Src-Port=29295, Dst-Port=0. Protocol=ICMP(1).
debug aspf packet提示的是首包被aspf丢弃了,因为是invalid status,这种情况下有可能是由于来回路径不一致导致的。因为由AC到终端是二层网络,进出接口分别为1/0/2和1/0/3,但是终端回包是首先扔给它的网关也就是防火墙上的vlan-int100,然后回到AC上,这样的话就存在来回路径不一致的情况,建议现场配置会话宽松session stae-machine mode loose之后,发现可以ping通了。
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