Technical data
Brocade ServerIron ADX Advanced Server Load Balancing Guide 63
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Other transparent cache switching options
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When cache server spoofing support is enabled, the ServerIron ADX does the following with
requests sent from a cache server to the Internet.
1. The ServerIron ADX looks at the MAC address to see if the packet is from a cache server. Note
that the ServerIron ADX and the cache server cannot be separated by any router hops; they
must be on the same physical segment. The ServerIron ADX uses an ARP request to get the
MAC address of each configured cache server.
2. If the MAC address indicates that the packet is from a cache server, the ServerIron ADX checks
the source IP address. If the source IP address does not match the cache server's IP address,
the ServerIron ADX concludes that this is a spoofed packet.
3. The ServerIron ADX creates a session entry for the source and destination (IP address and
port) combination, and then sends the request to the Internet.
When the origin server sends the content back, the ServerIron ADX looks for a session entry that
matches the packet. If the session entry is found, the ServerIron ADX sends the packet to the
appropriate cache server.
To enable cache server spoofing support, enter commands such as the following.
ServerIronADX(config)#server cache-group 1
ServerIronADX(config-tc-1)#spoof-support
Syntax: [no] spoof-support
The no form of the command disables cache server spoofing support. Cache server spoofing
support is disabled by default.
To display the number of spoofed packets encountered by the ServerIron ADX, enter the following
command.
Syntax: show cache-group
ServerIronADX#show cache-group
Cache-group 1 has 1 members Admin-status = Enabled Active = 0
Hash_info: Dest_mask = 255.255.255.0 Src_mask = 0.0.0.0
Cache Server Name Admin-status L4-Hash-Buckets L7-Hash-Buckets
cs1 6 0 0
Name: cs1 IP: 192.168.1.1 State: 6 Groups = 1
Spoof Enable Cache->Web-Server Web-Server->Cache
CurCon TotCon Packets Octets Packets Octets
Total 0 0 0000
Client->Cache Cache->Client
State CurCon TotCon Packets Octets Packets Octets
http active 0 0 0000
Total 0 0 0000