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VMware on AWS - How to restore NSX DFW firewall rules to previous state

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Customers who uses NSX day-in, day-out would like to have a point-in time restore functionality of DFW firewall rules. Many customer have a large footprints in VMC and make changes to DFW quite often. This feature was missing for long time and we could see its included in recent versions . Let's see how DFW configuration roll back works  NSX DFW configuration has versioning, and it is stored in the NSX Manager.  Every time when someone update DFW configuration, NSX creates one more version but keep storing the previous ones. You can rollback for previous config but reapplying it once again.  You can find the options under Networking & Security tab , > Security > Distributed Firewall . In the right side we see an Actions drop down. Choose View to get to the below screen.  Let’s go through the use case:  1. Original state- default config with no custom rules:  a. There are no saved configurations during last 30 days: In my existing test setup, with the current setting

Configure Cisco router as a basic DHCP server


Using a Cisco router as a DHCP server can simplify a network configuration by cetralizing DHCP services in a large network or decentralizing DHCP services to the endpoint routers at satellite locations. The ease of remote management of Cisco-based DHCP services is a great advantage.


conf t
service dhcp
ip dhcp pool 192.168.1.0/24
network 192.168.1.0 255.255.255.0
default-router 192.168.1.1
dns-server 192.168.1.5 192.168.1.6
exit
ip dhcp excluded-address 192.168.1.1 192.168.1.199
ip dhcp excluded-address 192.168.1.241 192.168.1.255
^Z


This example shows a Cisco router configuration as a basic DHCP server in the 192.168.1.0/24 network. The DHCP options implemented are default-router (DHCP option 3) and dns-server (DHCP option 6). Two DNS servers are configured. With the excluded-address commands, using only ip addresses between 192.168.1.200-192.168.1.240 will be available for client use.

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