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Example of Implementation

Example of Implementation. Kumpol Luengpetngam Telecommunication Division, RTH:Bangkok E-mail : kumpol@metnet.tmd.go.th. Implementation of TCP/IP at RTH Bangkok.

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Example of Implementation

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  1. Example of Implementation Kumpol Luengpetngam Telecommunication Division, RTH:Bangkok E-mail : kumpol@metnet.tmd.go.th

  2. Implementation of TCP/IP at RTH Bangkok The Bangkok RTH has implemented TCP/IP protocols for Tokyo RTH, Vientiane NMC and Kuala Lumpur NMC for data collection and exchange.

  3. Bangkok TCP/IP Network BANGKOK SIDE TOKYO SIDE CAT MSS Host at Bangkok TCP/IP Port Router Cisco 2600 DSU Modem Nokia BB 512 DSU Modem Nokia BB 512 CAT Frame Relay or ISDN Provider CAT Frame Relay or ISDN Provider DSU Modem Router Cisco 2650 TCP/IP Port MSS at Tokyo MSS Bangkok VIENTIANE SIDE NARMPNU EXCHANGE MSS VIENTIANE TOT Router Cisco 2600 NTU Modem NTU Modem TOT PCM Mux Provider ETL PCM 30 Mux Provider NTU Modem NTU Modem Router Cisco 1720 TCP/IP Port MSS at Vientaine Line Interface Line Interface G 703(4W) G 703(4W)

  4. Status TCP/IP at RTH Bangkok Tokyo (AS 64520) Kuala Lumpur (AS 65154) Vientiane (AS 64771) 193.105.180.9 Frame Relay Network 193.105.180.26 193.105.178.38 Frame Relay Network DDN Network 193.105.180.10 193.105.180.25 193.105.178.37 Bangkok (AS 64769)

  5. General concepts of Addressing A pair of official IP addresses for each pure IP link are assigned by WMO. The subnet mask is 255.255.255.252 which provides 62 subnets each with 2 hosts (routers). for eligible hosts. Each center declares a few official IP addresses an IP address for an eligible host Frame Relay Network Bangkok a pair of IP addresses for a Frame Relay links. Tokyo

  6. Tokyo AS 64520 193.105.180.9/30 Vientiane AS 64771 Kuala Lumpur AS 65154 193.105.178./38 193.105.180.26 Frame Relay Networks DDN Network 193.105.178./37 193.105.180.10/30 193.105.180.25 NAT (Network Address Translation) MSS 128.7.7.8 <--> private address for THAI4 128.7.7.2 <--> private address for THAI2 Router for GTS connections Cisco 2600 IOS Ver. 11.2 (3)T Bangkok AS 64769 203.155.200.97 Firewall Sentinet Ver2.1.3 Private IP address THAI4 (MSS) THAI2 (MSS)

  7. System configuration at Bangkok

  8. TCP/IP Supported Connection Diagram Existing Workstation and Plotter GTS Circuit 128.7.7.x LAN HUB Firewall Cisco Router DigitalAlpha 2100 Server Digital Alpha 4000 Server Internet 128.0.7.x LAN HUB Firewall

  9. Circuit configuration and Protocols in transport **Bangkok - Tokyo circuit configuration in physical level Circuit type : Frame relay Networks (NNI) Carriers : CAT (Thailand portion) Port speeds : 64 kbps (TMD-CAT) : 128 kbps (JMA-KDDI) Delay in network : Expecting less than a few of ten milliseconds

  10. Circuit configuration and Protocols in transport **Bangkok - Tokyo circuit configuration in logical level Connectivity : One Permanent Virtual Circuit (PVC) Identification of Multiplexing : Data Link Connection Identifier (DLCI) DLCI Values : 20 (Thailand portion) : 20 (Japan portion)

  11. Circuit configuration and Protocols in transport • Bangkok - Tokyo circuit configuration in logical level (next) • Logical speed guarantee : Committed Information Rate (CIR) • : 16Kbps (Flow from Bangkok to Tokyo) • : 16Kbps (Flow from Tokyo to Bangkok) • Interface : ITU-T Q.933 Annex A (Thailand portion) • : ITU-T Q.933 Annex A (Japan portion)

  12. Circuit configuration and Protocols in transport ** Protocols Link protocol : Frame Relay Network protocol : IP v4 (Internet Protocol version 4) : ICMP (Internet Control Message Protocol) for PING Transport protocol : TCP (Transmission Control Protocol) Routing protocol : Border Gateway Protocol version 4 (BGP-4) Compression : None Traffic type : Meteorological message in TCP socket stream. File Transfer in future

  13. TCP/IP Frame Relay sockets • The mechanism for store-and-forward, queing and others message processing should be kept. • The message structure in TCP socket stream complies with the “Recommended practices and procedure for the Implementation use and Application of TCP/IP on the GTS” (Attachment II-15 of manual on the GTS)

  14. Routing • Routing protocol • BGP-4 (Border Gateway protocol version 4) is used as dynamics routing protocol on the IP link.

  15. Autonomouse System (AS) • Autonomous System (AS) Private AS number assigned by WMO secretariat. The AS numbers for neighbour centres are: Bangkok RTH : AS 64769 Tokyo RTH : AS 64520 Kuala Lumpur NMC : AS 65154 Vientiane NMC : AS 64771

  16. Filtering • Filtering • To allow only agreed protocols (port Number). • To allow only agreed destination IP address. • To allow only agreed source address.

  17. Procedure for recover of missing data • Request/Repeat of missing text message - Requests for missing text messages should be sent on the text connection. T1T2 (in message header) of “BM” should be used. - A requested message should be retransmitted with its original heading and with the lastest channel sequence number.

  18. The request formats • Requesting a message (SOH) (CR)(CR)(LF) nnnn (CR)(CR)(LF) BMRR01 CaCaCaCa YYGGgg (CR)(CR)(LF) CCCC (CR)(CR)(LF) SQN nnnn= (CR)(CR)(LF)(ETX)

  19. The request formats • Requesting a selected number of messages (SOH) (CR)(CR)(LF) nnnn (CR)(CR)(LF) BMRR01 CaCaCaCa YYGGgg (CR)(CR)(LF) CCCC (CR)(CR)(LF) SQN nnnn/nnnn/nnnn= (CR)(CR)(LF)(ETX)

  20. The request formats • Requesting a continuous series of messages (SOH) (CR)(CR)(LF) nnnn (CR)(CR)(LF) BMRR01 CaCaCaCa YYGGgg (CR)(CR)(LF) CCCC (CR)(CR)(LF) SQN nnnn-nnnn= (CR)(CR)(LF)(ETX)

  21. Request/Repeat of missing binary messages • Requesting a message (SOH) (CR)(CR)(LF) nnnn (CR)(CR)(LF) BIRR01 CaCaCaCa YYGGgg (CR)(CR)(LF) CCCC (CR)(CR)(LF) SQN nnnn= (CR)(CR)(LF)(ETX)

  22. The request formats • Requesting a selected number of messages (SOH) (CR)(CR)(LF) nnnn (CR)(CR)(LF) BIRR01 CaCaCaCa YYGGgg (CR)(CR)(LF) CCCC (CR)(CR)(LF) SQN nnnn/nnnn/nnnn= (CR)(CR)(LF)(ETX)

  23. The request formats • Requesting a continuous series of messages (SOH) (CR)(CR)(LF) nnnn (CR)(CR)(LF) BIRR01 CaCaCaCa YYGGgg (CR)(CR)(LF) CCCC (CR)(CR)(LF) SQN nnnn-nnnn= (CR)(CR)(LF)(ETX)

  24. MSS : 203.155.200.97 203.155.200.98 MSS : 202.245.39.11 (cadess1) 202.245.39.12 (cadess2) To: Tokyo (text) ActiveOpen Port : 25703 Passive Open To: Tokyo (binary) Port : 25704 To: Bangkok (text) Port : 8025 Passive Open Active Open Port : 8026 To: Bangkok (binary) BANGKOK TOKYO TCP socket connections on operation basis

  25. FTP connection - The only FTP connection, DDN to NMC Vientiane. - Using two transmitting methods: PUT and GET. - Output for maximum 10 messages per file or Maximum 30 seconds time-relay consecutively. MSS: 203.155.200.97 203.155.200.98 MSS: 172.16.2.100 (AMSS) PUT to Vientiane Get from Vientiane DDN Get from Bangkok PUT to Bangkok BANGKOK VIENTIANE

  26. MSS : 203.155.200.97 203.155.200.98 MSS : 161.142.139.230 To: KL (text) ActiveOpen Port : 30006 Passive Open To: KL (binary) Port : 30007 To: Bangkok (text) Port : 9024 Passive Open Active Open Port : 9025 To: Bangkok (binary) BANGKOK Kuala Lumpur TCP socket connections on operation basis

  27. Trouble shooting and problem resolution Steps in resolving problems: • Check the remote centre (If the security policy of the remote centre allows it.) • Check if the link to the “outside” network is reachable. • Check the local network by trying to reach next gateway. • Check the local IP stack and configuration.

  28. Basic tools for investigation • Ping • Ping will check if the destination IP address can be reached. # PING TK1 PING TK1 (202.245.39.11): 56 DATA BYTES 64 BYTES FROM 202.245.39.11: ICMP_SEQ=0 TTL=59 TIME=177 MS 64 BYTES FROM 202.245.39.11: ICMP_SEQ=1 TTL=59 TIME=166 MS 64 BYTES FROM 202.245.39.11: ICMP_SEQ=2 TTL=59 TIME=167 MS 64 BYTES FROM 202.245.39.11: ICMP_SEQ=3 TTL=59 TIME=165 MS

  29. Basic tools for investigation (next) ----TK1 PING STATISTICS---- 4 PACKETS TRANSMITTED, 4 PACKETS RECEIVED, 0% PACKET LOSS ROUND-TRIP (MS) MIN/AVG/MAX = 165/169/177 MS # PING TKR PING TKR (193.105.180.9): 56 DATA BYTES 64 BYTES FROM 193.105.180.9: ICMP_SEQ=0 TTL=253 TIME=162 MS 64 BYTES FROM 193.105.180.9: ICMP_SEQ=1 TTL=253 TIME=165 MS 64 BYTES FROM 193.105.180.9: ICMP_SEQ=2 TTL=253 TIME=167 MS ----TKR PING STATISTICS---- 3 PACKETS TRANSMITTED, 3 PACKETS RECEIVED, 0% PACKET LOSS ROUND-TRIP (MS) MIN/AVG/MAX = 162/165/167 MS #

  30. Basic tools for investigation (next) • Traceroute • Traceroute is used to show which routes are transited on the network between two centres. Firewall or packet filter on router may block the traffic as part of local security policy.

  31. Basic tools for investigation (next) • # TRACEROUTE TK1 • TRACEROUTE TO TK1 (202.245.39.11), 30 HOPS MAX, 40 BYTE PACKETS • 1 SENT1 (128.7.7.200) 1 MS 1 MS 1 MS • 2 ROUTER1 (203.155.200.99) 1 MS 1 MS 1 MS • 3 TKR (193.105.180.9) 173 MS 193 MS 172 MS • 4 TKR (193.105.180.9) 163 MS * 196 MS • 5 * TKR (193.105.180.9) 149 MS * • 6 TKR (193.105.180.9) 155 MS * 158 MS

  32. Basic tools for investigation (next) # TRACEROUTE TKR TRACEROUTE TO TKR (193.105.180.9), 30 HOPS MAX, 40 BYTE PACKETS 1 SENT1 (128.7.7.200) 1 MS 1 MS 0 MS 2 ROUTER1 (203.155.200.99) 2 MS 1 MS 1 MS 3 TKR (193.105.180.9) 156 MS * 147 MS #

  33. Basic tools for investigation (next) # NETSTAT -NR ROUTING TABLES DESTINATION GATEWAY FLAGS REFS USE INTERFACE NETMASKS: INET 255.255.0.0 ROUTE TREE FOR PROTOCOL FAMILY 2: DEFAULT 128.7.7.200 UGS 6 153463 TU0 63.174.196.210 128.0.7.200 UGHS 0 0 TU1 127.0.0.1 127.0.0.1 UH 1 32752 LO0 128/16 128.0.7.8 U 10 707939 TU1 128.7/16 128.7.7.8 U 38 3765211 TU0 161.142.139.230 128.7.7.200 UGHS 2 21309 TU0

  34. Basic tools for investigation (next) 161.142.139.231 128.7.7.200 UGHS 2 7919 TU0 192.168.2.128 128.0.7.200 UGHS 0 9 TU1 203.144.197.3 128.0.7.200 UGHS 0 0 TU1 203.155.200.113 128.0.7.200 UGHS 0 0 TU1 206.79.34.9 128.0.7.200 UGHS 0 0 TU1 207.44.45.186 128.0.7.200 UGHS 0 143 TU1 207.44.45.187 128.0.7.200 UGHS 0 0 TU1 #

  35. SAWADDEE

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