ION-DTN开启LTP、UDP传输服务

在本人介绍ION的RC文件的博文中：

http://blog.csdn.net/hahachenchen789/article/details/54286644

详细介绍了ION-DTN的运行是依靠rc文件的配置，并分析了RC文件的组成。

在这份rc文件中，是利用LTP协议充当汇聚层的基本设置。

## begin ionadmin  # ionrc configuration file for host3 in a 3node ltp test.  #This uses ltp as the convergence layer.  #command: % ionadmin host3.ionrc  #This command should be run FIRST.  #  #Soochow University, April 2012  # Initialization command (command 3).  #Set this node to be node 3 (as in ipn:3).  #Use sdr configuration of “ionconfig” file.    1 1 ionconfig  # start ion node  s  # Add some contacts.  #They will start at +0 seconds from now, ending +86400 seconds from now.  #They will connect node 1 to node 2, and connect node 2 to node 3.  #They will transmit 125000 bytes/second.  #Note that contacts are unidirectional, so order matters.    a contact +0 [phone]  a contact +0 [phone]    # Add some ranges. These are the physical distance between nodes.  #They will start at +0 seconds from now, ending +86400 seconds from now.  #They will connect node 1 to node 2, and connect node 2 to node 3.  #We will assume every range is one second. Data on the link is expected to take 1 second  #to reach the other end (One Way Light Time).  #Note that ranges cover both directions, so you only need define one range for any  #combination of nodes.    a range +0 [phone]    # set this node to consume and produce a mean of 1000000 bytes/second.    m production 1000000  m consumption 1000000  m horizon +0  ## end ionadmin  ## begin ionsecadmin    1  e 1  ## end ionsecadmin  ## begin ltpadmin  # ltprc configuration file for host1 in a 3node ltp test.  #Command: % ltpadmin host3.ltprc  #This command should be run AFTER ionadmin and BEFORE bpadmin.  #  #Soochow University, April 2012  #  #A warning: the ltp configuration is not ideal in this case.  #please consult manual pages and other documentation for a better description.  # Initialization command (command 1).  # Establishes the LTP retransmission window.  # (Prohibiting LTP from seizing all available storage).  #A maximum of 5 sessions. A session is assumed to be around one second of  #transmission. This value should be estimated at the sum of maximum round-trip  #times(in seconds) for all "spans." Suggest throwing 20% higher number of sessions  #to account for extra- long sessions which contain an actual retransmission. Set a total  #LTP memory space usage limit of 1200000 as the sum of the memory space usage of  #all spans (more or less the number of bytes in transit on all links for their duration).    1 5 1200000  # Add a span. (a connection)  #Identify the span as engine number 2. That is the ipn node number of the node on  #the other end of this span. Use 5 as the maximum number of export sessions.  #Use 120000 as the maximum size of an export block. This more or less limits the  #maximum size of a bundle in the system. The next two items are the maximum  #number of import sessions and the maximum size of an imported block.  #Since this is connect, we just copy the export numbers here.  #1400 is the maximum segment size- more or less, the amount of data that can be  #held in a single frame of the underlying protocol. In this case, UDP packets are  #the frame, and we will give a conservative limit.  #Limit the aggregation size to 120000 bytes, and set a time limit on aggregation to 1  #second. Use the command 'udplso 10.0.0.4:1113' to implement the link itself.  #In this case, we use udp to connect to host2 (10.0.0.4 is host2's ipaddr) using port 1113  #(defined by IANA as the default UDP port for Licklider Transmission Protocol).  #The single quote is important, don't use double quotes.  a span 2 5 120000 5 120000 1400 120000 1 'udplso 10.0.0.4:1113'  # Start command.  #This command actually runs the link service output commands  #(defined above, in the "a span" commands).  #Also starts the link service INPUT task 'udplsi 10.0.0.5:1113' to  #listen locally on UDP port 1113 for incoming LTP traffic.  s 'udplsi 10.0.0.3:1113'  m screening n  w 1  ## end ltpadmin  ## begin bpadmin  # bprc configuration file for host3 in a 3node ltp test.  #Command: % bpadmin host3.bprc  #This command should be run AFTER ionadmin and ltpadmin and  #BEFORE ipnadmin or dtnadmin.  #  #Soochow University, April 2012  # Initialization command (command 1).    1    # Add an EID scheme.  #The scheme's name is ipn.  #This scheme's forwarding engine is handled by the program 'ipnfw.'  #This scheme's administration program (acting as the custodian daemon) is 'ipnadminep.'    a scheme ipn 'ipnfw' 'ipnadminep'    # Add endpoints.  #Establish endpoints ipn:3.1 and ipn:3.2 on the local node.  #The behavior for receiving a bundle when there is no application currently accepting  #bundles, is to queue them 'q', as opposed to immediately and silently discarding  #them (use 'x' instead of 'q' to discard).  #Note that the custodian endpoint ipn:3.0 is automatically generated.  a endpoint ipn:1.0 q  a endpoint ipn:1.1 q  a endpoint ipn:1.2 q  # Add a protocol.  #Add the protocol named ltp.  #Estimate transmission capacity assuming 1400 bytes of each frame (in this case, udp  #on ethernet) for payload, and 100 bytes for overhead.  a protocol ltp 1400 100  # Add an induct. (listen)  #Add an induct to accept bundles using the ltp protocol.  #The duct's name is 3 (this is for future changing/deletion of the induct).  #The induct itself is implemented by the 'ltpcli' command.  a induct ltp 1 ltpcli  # Add an outduct. (send to host2)  #Add an outduct to send bundles using the ltp protocol.  #The duct's name is 2(this is for future changing/deletion of the outduct).  #The outduct itself is implemented by the 'ltpclo' command.  a outduct ltp 2 ltpclo  #Start bundle protocol engine, also running all of the induct, outduct, and  #administration programs defined above  s  #w 1  ## end bpadmin  ## begin ipnadmin  # ipnrc configuration file for host3 in a 3node ltp test.  #Essentially, this is the IPN scheme's routing table.  #Command: % ipnadmin host1.ipnrc  #This command should be run AFTER bpadmin (likely to be run last).  #  #Soochow University, April 2012  # Add an egress plan.  #Bundles to be transmitted to element number 2 can be transmitted directly to host2  #using ltp outduct identified as ‘2.’  #See your bprc file or bpadmin for outducts/protocols you can use.  a plan 2 ltp/2  ## end ipnadmin  

其中，这一段是LTP传输的设置：

a protocol ltp 1400 100  # Add an induct. (listen)  #Add an induct to accept bundles using the ltp protocol.  #The duct's name is 3 (this is for future changing/deletion of the induct).  #The induct itself is implemented by the 'ltpcli' command.  a induct ltp 1 ltpcli  # Add an outduct. (send to host2)  #Add an outduct to send bundles using the ltp protocol.  #The duct's name is 2(this is for future changing/deletion of the outduct).  #The outduct itself is implemented by the 'ltpclo' command.  a outduct ltp 2 ltpclo  #Start bundle protocol engine, also running all of the induct, outduct, and  #administration programs defined above  s  #w 1  ## end bpadmin  ## begin ipnadmin  # ipnrc configuration file for host3 in a 3node ltp test.  #Essentially, this is the IPN scheme's routing table.  #Command: % ipnadmin host1.ipnrc  #This command should be run AFTER bpadmin (likely to be run last).  #  #Soochow University, April 2012  # Add an egress plan.  #Bundles to be transmitted to element number 2 can be transmitted directly to host2  #using ltp outduct identified as ‘2.’  #See your bprc file or bpadmin for outducts/protocols you can use.  a plan 2 ltp/2  ## end ipnadmin  

这行代码是利用ltp作为汇聚层协议，数据帧的有效载荷是1400bytes，头部开销是100bytes。

a protocol ltp 1400 100  

该行代码是增加一个接收端口

a induct ltp 1 ltpcli  

该行代码是增加一个发送端口

a outduct ltp 2 ltpclo  

这行代码是增加一个发送计划

a outduct ltp 2 ltpclo  

以上是利用LTP，接下来利用UDP层作为汇聚层进行传输，只需修改上述的四行代码即可。

增加一个汇聚层协议,这里选择 UDP 协议

a protocol udp 1400 100

增加一个帧听(或接收)接口

a induct udp <Local IP Address>:<Local Port> udpcli例如, a induct udp 10.0.0.3:4556 udpcli

增加一个发送(或外出)接口。

a outduct udp * udpclo

注: UDP 协议是无连接协议,在这里无须指明目的 IP 地址,“ * ”表示任意地址。

增加一个发送计划。

a plan <Number of Node> udp/*,<Destination IP Address>:<Destination Port>

例如, a plan 2 udp/*,10.0.0.4:4556

注:当 UDP 协议作汇聚层时,在增加发送计划的时候必须指明发送的目的 IP 地址和端口。