These servers are listed in the Custom nameservers box that will appear, with a single address per line. Specify nameservers. - Clients will be given a list of DNS servers configured by the administrator.Use Umbrella - Clients will be instructed to send DNS queries to Cisco Umbrella DNS Servers.Use Google Public DNS - Clients will be instructed to send DNS queries to Google's Public DNS servers.Proxy to upstream DNS - (MX only) The MX will provide clients with its LAN IP as the DNS server, then proxy any DNS queries to the server(s) it has been configured to use on its Internet port(s).These are used to resolve names (such as ) to IP addresses. DNS nameservers - Which addresses are provided to clients requesting DNS servers.Lease time - How long clients will have an address allocated to them, before the lease expires and the client must renew.This address must be in the same subnet as the clients. Gateway IP - (Only for Static routes) Indicates what default gateway IP address should be given to clients in this subnet.If set to 'Run a DHCP server', the following options will become available: If DHCP is still desired, another server must exist to handle the requests. This disables the DHCP service for this subnet. Do not respond to DHCP requests - The MX/MS will not process or forward DHCP messages on this subnet.Whichever server responds back first is where the communication will continue. Note: If there are multiple DHCP relay server IPs configured for a single subnet, the MX/MS will send the DHCP discover message to all servers. The DHCP server IP field will appear and is used to indicate where DHCP messages should be forwarded to. Relay DHCP to another server - The MX/MS will forward DHCP messages to a server on a different VLAN or over the site-to-site VPN.If selected, the other options below will become available. Run a DHCP server - The MX/MS will use its internal DHCP server to provide addressing and other information to clients.Once there, the Client addressing setting will determine how DHCP messages are handled on that VLAN/subnet. For switch networks: Switch > Configure > Layer 3 routing, and select the desired interface.For security appliance networks: Security appliance > Configure > DHCP, and refer to the section for the desired VLAN/subnet.When enabled, it can provide DHCP to all configured subnets/VLANs, or relay DHCP messages to designated DHCP servers.
#CONFIGURE DHCP ON CISCO SWITCH SERIES#
The MX Series Security Appliances and MS Series Switches (with layer 3 routing enabled) have a built-in DHCP service.
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