Brocade Communications Systems 12.4.00 Syntax no server source-ipip-addr ip-mask default-gateway

1 Proxy for DNS server

For example, the GSLB ServerIron ADX shown in Figure 1 on page 4 needs a source IP address in the subnet 209.157.23.x. Without this source IP address, Layer 4 and Layer 7 health checks to the ServerIron ADXs at the Sunnyvale site (209.157.22.x) and the Atlanta site (192.108.22.x) cannot reach the GSLB ServerIron ADX.

To add a source IP address, enter a command such as the following:

ServerIronADX(config)# server source-ip 209.157.23.225 255.255.255.0 0.0.0.0

Syntax: [no] server source-ip<ip-addr> <ip-mask> <default-gateway>

The <ip-addr>parameter specifies the IP address. Specify an address that is in the same subnet as the GSLB ServerIron ADX’s management IP address. Do not specify an address that is already in use.

The <ip-mask>parameter specifies the network mask.

The <default-gateway>parameter specifies the default gateway. This parameter is required, but if you do not want to specify a gateway, enter “0.0.0.0”.

Configuring real server and virtual server for the DNS server

NOTE

The virtual server IP address (VIP) will be the Authoritative DNS server for the GSLB Domain.

To configure a real server and virtual server and bind them together for a proxy DNS server, enter commands such as the following:

ServerIronADX(config)# server real-name dns_ns 209.157.23.46

ServerIronADX(config-rs-dns_ns)# port dns proxy

ServerIronADX(config-rs-dns_ns)# exit

ServerIronADX(config)# server virtual-name-or-ip dns-proxy 209.157.23.87

ServerIronADX(config-vs-dns-proxy)# port dns

ServerIronADX(config-vs-dns-proxy)# bind dns dns_ns dns

The commands in this example add a real server called “dns_ns”. The DNS server has IP address 209.157.23.46. When you add the real server, the CLI changes to the Real Server configuration level. At this level, you can add TCP or UDP ports and, optionally, modify health check parameters. In this example, the DNS port is added. Notice that the proxy option is specified following the dns option. The proxy option is required to indicate that this real server is part of a proxy DNS server configuration.

If the DNS server is in a different subnet than the GSLB ServerIron ADX, you must configure a source IP address on the ServerIron ADX for use by the health checks. If the GSLB ServerIron ADX is in a one-armed configuration or the DNS server is at least one hop away, you must configure a source IP address and also enable source NAT. (You do not need to add another source IP address if you have already added one for the remote sites. The GSLB ServerIron ADX can use the same source IP address for reaching the remote sites and for reaching the DNS server.)

ServerIronADX(config)# server real-name dns_ns 209.157.23.46

ServerIronADX(config-rs-dns_ns)# port dns proxy

ServerIronADX(config-rs-dns_ns)# exit

The server virtual-name-or-ipcommand adds a virtual server called “dns-proxy”. This command changes the CLI to the Virtual Server configuration level. At this level, the port dns command adds the DNS port to the virtual server. The bind command binds the DNS port on the real server to the DNS port on the virtual server.

18	ServerIron ADX Global Server Load Balancing Guide
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