DHCP forwarding with Cisco and Fortigate

When configuring a network with a central Fortigate firewall and a Cisco 871 router placed on the site I had a problem getting the DHCP relay feature to work.

On the Cisco router I configured the interface as shown below:

interface Vlan1
 ip address 10.10.10.10 255.255.255.0
 ip helper-address 1.1.1.1

The Cisco router forwarded the DHCP packet but I did not get any IP address. When using a packet sniffer I found that the Cisco router sent out the packet with source address=0.0.0.0. The Fortigate firewall did not approve this.

To solve this I removed the helper-address and typed in these lines instead:

service dhcp
ip dhcp relay information policy keep
ip dhcp pool LAN
 relay source 10.10.10.0 255.255.255.0
 relay destination 1.1.1.1

This changed the source address and solved my DHCP forwarding issue.

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Hide the computer from the network browse list

Read from Microsoft how to hide your computer from the network browse list.

med henvisning til: How to Hide the Server's Computer Name from Other Computers in the Domain (vis på Googles sidewiki)