DELL Sonic Firewall and Cisco layer 3
switches Configuration
It is sometimes difficult for the Sonic firewall to
communicate with TRUNK settings of Cisco Switches.
The switch has multiple VLANs configured and there will be a
single cable connecting to the DELL Sonic firewall.
Firewall need to
learn all the Subnets configured in the switch network.
Please configure port to the firewall on the switch side
Enable interface VLAN 1 in switch—VLAN 1 is default VLAN
conf t
interface Vlan1
ip address 192.168.1.6 255.255.255.0
exit
ip default-gateway 192.168.1.1 (ip of firewall interface)
ip route 0.0.0.0 0.0.0.0 192.168.1.1
SONIC Firewall port Configuration
interface FastEthernet1/0/1
description Uplink to
SonicWall
switchport access
vlan 1
switchport mode
access
spanning-tree
portfast
end
SONIC FIREWALL SIDE
Assign an IP address to the inside interface like
192.168.1.1
Create static route – do not summarize the routes pointing
all the internal subnets to the Cisco switch example 192.168.1.6
For example
ip route 10.20.2.0 255.255.255.0 192.168.1.6
ip route 10.30.2.0 255.255.255.0 192.168.1.6
ip route 10.40.2.0 255.255.255.0 192.168.1.6
Firewall will start to communicate with Switch side subnets.