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+#
+# IP Virtual Server configuration
+#
+menu    "IP: Virtual Server Configuration"
+        depends on INET && NETFILTER
+
+config  IP_VS
+        tristate "IP virtual server support (EXPERIMENTAL)"
+        depends on INET && NETFILTER
+        ---help---
+          IP Virtual Server support will let you build a high-performance
+          virtual server based on cluster of two or more real servers. This
+          option must be enabled for at least one of the clustered computers
+          that will take care of intercepting incoming connections to a
+          single IP address and scheduling them to real servers.
+
+          Three request dispatching techniques are implemented, they are
+          virtual server via NAT, virtual server via tunneling and virtual
+          server via direct routing. The several scheduling algorithms can
+          be used to choose which server the connection is directed to,
+          thus load balancing can be achieved among the servers.  For more
+          information and its administration program, please visit the
+          following URL: <http://www.linuxvirtualserver.org/>.
+
+          If you want to compile it in kernel, say Y. To compile it as a
+          module, choose M here. If unsure, say N.
+
+config  IP_VS_DEBUG
+        bool "IP virtual server debugging"
+        depends on IP_VS
+        ---help---
+          Say Y here if you want to get additional messages useful in
+          debugging the IP virtual server code. You can change the debug
+          level in /proc/sys/net/ipv4/vs/debug_level
+
+config  IP_VS_TAB_BITS
+        int "IPVS connection table size (the Nth power of 2)"
+        depends on IP_VS 
+        default "12" 
+        ---help---
+          The IPVS connection hash table uses the chaining scheme to handle
+          hash collisions. Using a big IPVS connection hash table will greatly
+          reduce conflicts when there are hundreds of thousands of connections
+          in the hash table.
+
+          Note the table size must be power of 2. The table size will be the
+          value of 2 to the your input number power. The number to choose is
+          from 8 to 20, the default number is 12, which means the table size
+          is 4096. Don't input the number too small, otherwise you will lose
+          performance on it. You can adapt the table size yourself, according
+          to your virtual server application. It is good to set the table size
+          not far less than the number of connections per second multiplying
+          average lasting time of connection in the table.  For example, your
+          virtual server gets 200 connections per second, the connection lasts
+          for 200 seconds in average in the connection table, the table size
+          should be not far less than 200x200, it is good to set the table
+          size 32768 (2**15).
+
+          Another note that each connection occupies 128 bytes effectively and
+          each hash entry uses 8 bytes, so you can estimate how much memory is
+          needed for your box.
+
+comment "IPVS transport protocol load balancing support"
+        depends on IP_VS
+
+config  IP_VS_PROTO_TCP
+        bool "TCP load balancing support"
+        depends on IP_VS
+        ---help---
+          This option enables support for load balancing TCP transport
+          protocol. Say Y if unsure.
+
+config  IP_VS_PROTO_UDP
+        bool "UDP load balancing support"
+        depends on IP_VS
+        ---help---
+          This option enables support for load balancing UDP transport
+          protocol. Say Y if unsure.
+
+config  IP_VS_PROTO_ESP
+        bool "ESP load balancing support"
+        depends on IP_VS
+        ---help---
+          This option enables support for load balancing ESP (Encapsultion
+          Security Payload) transport protocol. Say Y if unsure.
+
+config  IP_VS_PROTO_AH
+        bool "AH load balancing support"
+        depends on IP_VS
+        ---help---
+          This option enables support for load balancing AH (Authentication
+          Header) transport protocol. Say Y if unsure.
+
+comment "IPVS scheduler"
+        depends on IP_VS
+
+config  IP_VS_RR
+        tristate "round-robin scheduling"
+        depends on IP_VS
+        ---help---
+          The robin-robin scheduling algorithm simply directs network
+          connections to different real servers in a round-robin manner.
+
+          If you want to compile it in kernel, say Y. To compile it as a
+          module, choose M here. If unsure, say N.
+ 
+config  IP_VS_WRR
+        tristate "weighted round-robin scheduling" 
+        depends on IP_VS
+        ---help---
+          The weighted robin-robin scheduling algorithm directs network
+          connections to different real servers based on server weights
+          in a round-robin manner. Servers with higher weights receive
+          new connections first than those with less weights, and servers
+          with higher weights get more connections than those with less
+          weights and servers with equal weights get equal connections.
+
+          If you want to compile it in kernel, say Y. To compile it as a
+          module, choose M here. If unsure, say N.
+
+config  IP_VS_LC
+        tristate "least-connection scheduling"
+        depends on IP_VS
+        ---help---
+          The least-connection scheduling algorithm directs network
+          connections to the server with the least number of active 
+          connections.
+
+          If you want to compile it in kernel, say Y. To compile it as a
+          module, choose M here. If unsure, say N.
+
+config  IP_VS_WLC
+        tristate "weighted least-connection scheduling"
+        depends on IP_VS
+        ---help---
+          The weighted least-connection scheduling algorithm directs network
+          connections to the server with the least active connections
+          normalized by the server weight.
+
+          If you want to compile it in kernel, say Y. To compile it as a
+          module, choose M here. If unsure, say N.
+
+config  IP_VS_LBLC
+        tristate "locality-based least-connection scheduling"
+        depends on IP_VS
+        ---help---
+          The locality-based least-connection scheduling algorithm is for
+          destination IP load balancing. It is usually used in cache cluster.
+          This algorithm usually directs packet destined for an IP address to
+          its server if the server is alive and under load. If the server is
+          overloaded (its active connection numbers is larger than its weight)
+          and there is a server in its half load, then allocate the weighted
+          least-connection server to this IP address.
+
+          If you want to compile it in kernel, say Y. To compile it as a
+          module, choose M here. If unsure, say N.
+
+config  IP_VS_LBLCR
+        tristate "locality-based least-connection with replication scheduling"
+        depends on IP_VS
+        ---help---
+          The locality-based least-connection with replication scheduling
+          algorithm is also for destination IP load balancing. It is 
+          usually used in cache cluster. It differs from the LBLC scheduling
+          as follows: the load balancer maintains mappings from a target
+          to a set of server nodes that can serve the target. Requests for
+          a target are assigned to the least-connection node in the target's
+          server set. If all the node in the server set are over loaded,
+          it picks up a least-connection node in the cluster and adds it
+          in the sever set for the target. If the server set has not been
+          modified for the specified time, the most loaded node is removed
+          from the server set, in order to avoid high degree of replication.
+
+          If you want to compile it in kernel, say Y. To compile it as a
+          module, choose M here. If unsure, say N.
+
+config  IP_VS_DH
+        tristate "destination hashing scheduling"
+        depends on IP_VS
+        ---help---
+          The destination hashing scheduling algorithm assigns network
+          connections to the servers through looking up a statically assigned
+          hash table by their destination IP addresses.
+
+          If you want to compile it in kernel, say Y. To compile it as a
+          module, choose M here. If unsure, say N.
+
+config  IP_VS_SH
+        tristate "source hashing scheduling"
+        depends on IP_VS
+        ---help---
+          The source hashing scheduling algorithm assigns network
+          connections to the servers through looking up a statically assigned
+          hash table by their source IP addresses.
+
+          If you want to compile it in kernel, say Y. To compile it as a
+          module, choose M here. If unsure, say N.
+
+config  IP_VS_SED
+        tristate "shortest expected delay scheduling"
+        depends on IP_VS
+        ---help---
+          The shortest expected delay scheduling algorithm assigns network
+          connections to the server with the shortest expected delay. The 
+          expected delay that the job will experience is (Ci + 1) / Ui if 
+          sent to the ith server, in which Ci is the number of connections
+          on the the ith server and Ui is the fixed service rate (weight)
+          of the ith server.
+
+          If you want to compile it in kernel, say Y. To compile it as a
+          module, choose M here. If unsure, say N.
+
+config  IP_VS_NQ
+        tristate "never queue scheduling"
+        depends on IP_VS
+        ---help---
+          The never queue scheduling algorithm adopts a two-speed model.
+          When there is an idle server available, the job will be sent to
+          the idle server, instead of waiting for a fast one. When there
+          is no idle server available, the job will be sent to the server
+          that minimize its expected delay (The Shortest Expected Delay
+          scheduling algorithm).
+
+          If you want to compile it in kernel, say Y. To compile it as a
+          module, choose M here. If unsure, say N.
+
+comment 'IPVS application helper'
+        depends on IP_VS
+
+config  IP_VS_FTP
+        tristate "FTP protocol helper"
+        depends on IP_VS && IP_VS_PROTO_TCP
+        ---help---
+          FTP is a protocol that transfers IP address and/or port number in
+          the payload. In the virtual server via Network Address Translation,
+          the IP address and port number of real servers cannot be sent to
+          clients in ftp connections directly, so FTP protocol helper is
+          required for tracking the connection and mangling it back to that of
+          virtual service.
+
+          If you want to compile it in kernel, say Y. To compile it as a
+          module, choose M here. If unsure, say N.
+
+endmenu