衛星回線における動的経路制御機構への データリンク状態反映機構
Contents
1. Hell Interval 200 500msec GO D E D Hello Interval 275msec 00000000 Route FlapQOOOOOOOOOOOOOO OC000000000000000Hello Interval 00 00 0000000000000 O00000000000000000000000000000000000000O Hello Interval O BOBO 111 3 2 OSPF Route Flapping 0000 BGP Route Flap 00 00 0000 BGP Route Flap Damping 5 Hl 00000 O O O Route OO B Ul D D OU D D D U D TOO D DU DU Route Flap O BGP Route Flap Damping 0 O0 D Flap 00 0000 000000000000000000000O 0000000310000 O O Suppress Limit O Reuse Limit OO 00000000000000000 Suppress Limit Reuse Limit 979 ANTIQEISUT 5 0 5 Route Flap 0 000000 BGP Route Flap Damping 0000 Suppress Limit 0O 0000 ESAU DU U B D U LU2. Hello 4 0000000000000000000 Q0000000000000000000000 Hello Interv 0 00 00 0000000000000000000000000000 Q00000000000000000000000000 L1 2 1 2 RIP HIDUUDODUDUDUDUDUDUOUDDUDUDUDDUUUDUDUOUDDDUDDUDU DUU Q0000000000000000000000000000000000000000 00000 0000000300 d00000000000000000000000 Q00000000000000000000000000000000 6000000 18000000000 00000000000000000 osPF Q000000000000000000000000000000000000000 Q000000000000000000RIPT TO TOTO TOCCO 11717 11 Q000000000000000000000000000000000000000 Q00000000000000000000000 2 1 3 BGP BGP DU Keep Aver 00 000000 000000000000000BGP0O TOPO 00000 TO TOTO TO TOTO TCP l Q0000000000000000000000000 Keep Alive UO 000000000000 Hello GO 00 0000000000000 Q000000000000000000000000000000000000000 Q00000000000000000000000000000 Keep 401 111111 0000000 TCPA 000000000 Q0000000000000000000000000000000000000000 Q00000000000000000000000000 2 14 OSPFO 00000000 0000000000000 00000000000000 Q0000000000000000000000000000000000000000 Q00000000000000000000000 RIPO0O0D00D00000000000000000000000000000000 Q000000000000000000000000000000000000000 11111 sGPOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOA
3. Q000000000000000000000000000000000000000 ioctLe O if get Bags HU DUDU 0000000 get interface flags already editted for LSSA client void if_get_flags struct interface ifp int ret int flag struct ifreq ifreq ifreq_set_name amp ifreq ifp get the information from LSSA client ret if ioctl SIOCGIFFLAGS caddr_t amp ifreq flag lssa_client if flag ret if set flags ifp IFF UP IFF RUNNING else ret if unset flags ifp IFF UP if ret lt 0 perror ioctl return 27 ifp gt flags ifreq ifr flags amp 0x0000ffff 6 7 3 DOOUUUUUUU OSPF cost 0 0 0 00 0 28 0704 UY DODoOOoLSsSApg DO 0000000000000 000000000000 1 UUUU Q000000000000000000 e 00000000 s 7 2 OOOO 721 LSSACG 0000000000000 7100000000000 D DU D Reuter A Router B 20000000000000000200000000000000000 QO0O000ORouter A 1 540 722 UIUUUUUUUUUUUUUUUUUU Q00000000000000000000 710000 071 00000000000000 Operation System CPU Memory Router A FreeBSD 5 1 RELEASE Pentium III 1GHz 512MByte Router B FreeBSD 4 8 RELEASE Pentium III 1GHz 512MByte 29 Router A E0 0 0 2 3
4. 12 UUUUUUU Q00000000000000000000000000000000000000 Q000000000000000000000000000000000000000 Q000000000000000000000000000000000 Q0000000000000000000000000000000000000d Q000000000000000000000000000 0000000000000 0000000000 0000 0000000000O Q000000000000000000000000000000000000000 Q000000000000000000 1 3 O00000 Q00000000000000000000000000000000000000 Q000000000000000000000000000000000000000 Q000000000000000000000000000000000000000 Q000000000000000000000000000000000 14 000000 Q00000000000000000000000000000000000000 Q000000000000000000000000000000000000000 Q000000000000000000000000000000000000000 Q000000000000000000000000000000000000000 Q0000000000000000000000000000 024 1 Q0000000000000000000000000000000000000000 Q000000000000000000000000000000000000000 Q000000000000000000000000000000000000000 11111 2 1 UUUUUUUUUUUUUUUUUUUUHUHUL Q00000000000000000000000000000000000000 OSPF Open Shortest Path First 1 O RIP Routing Information Protocol 2 BGP Border Gateway Protocol 3 00000 000000000000 2 1 1 OSPF OSPF DO 0 0000000 0000000000000 Hello 000 0000000000000 00000000000000000000000000 Q00000000000000000 Bellot 00 000 00000000000 Hellof IDD Helo Interval 0000000000 1000000 Hello Q000000000000000000000000000000000000000 U000D0 Router Dead Interval 0000000000 3000000 Hello Interval JO 000000000000000000000000000000
5. nihil pe awa rds St MIDI O TA nto sas han ata GRE n Y Sai AE ET ID e is tot erac E RT AT EIER 2 c kau Cal qa a SO SPM elia d S bua LU DE REEL 544 aeons nde rte a 7 2 2 DUO0OO0O000000000000000 e ern hs K Wee EE DC EIA rea Tae inet oats Aqa QB ae ICT T ad DU Saa kas tess da EE AA PER BEES Ta ayasa g n EE BD on le dto tet rt 82 2 TAO ERGIBT a 823 OOO OU EEE 74484 y Beit Es deas BET i si EEL a e M ae Au los ba OTe eh CR PL E EEN E ES Ce RENE WEE ME e cleat sayu a Sete Meats ntt des 5 AAO TA HEI dte RR Ba ka sa Z pe Alia 8 MWD E p HKH HHH ELE mme tomos 9 THULE BE D ehe 11 EE E SE BENE ss mti n tee ee it e da 12 MAPEO ed a o 13 HHH HH FD down EI E ase ar tene ae da al 15 E VE EVE 2 ee ote fbr em aed Gs 16 LEVE o pes EE s az s uu Sau SASS Abu s Q 17 a aea Se ct Aa Ke a aia TEE fe S 19 MWD HERTRICH FAME do RR E d d 21 ESSA TA TARATA e aana coe E e de 23 ESSA DHE
6. Q00005000000000000000000 61 OOOO LSsA0000000610000 LSSATI OOOO 6 1 Operating System FreeBSD 4 8 RELEASE CPU Pentium III 1 3GHz Memory 512MByte Hard Disk 40GByte gcc version 2 95 4 DataBase mysql 4 0 15 client 10 mysql 4 0 12 server MWD 0 4 3 Routing Daemon zebra 0 93a 11 6 2 11111711711 LSSATCO00000000000000000000000000000000 q6100000000 L00000000000000000000 2000000000 3 LSSAC TO OO 000 0000000000000 40000000000000 OSPF cost 24 i Reflecting Data client i Module for i Judge Data i gt Module for gii cj GotData Lei Information of all are up or down 6 1 LSSA 1 DJ U 63 UUUUUUUUUUUUU data fs test data ts test 1 1 1 Table 00000 OOOOUOODOLSSAQGO38000000000000000000000000000 Q00000000000000000000000000000000000000O Q000000000000000000000000000000000000000O ut 63 1 UUUUUUUUUU Q000000000000000000000000000000 define DSYNC DK define RSL 45 0000 define EBNO 12 0000 25 64 UUUUUUUUUUUU dagaistestQQOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO 11711111111 data vs tet RSLO 000000 00000000000000 11111111111 data fs test struct data fs test int ts time stamp unsigned double mf
7. TN z 3 ANJ 4 c D 430000000000 Q00000000000000000000000000000000000000 L00000000000 20000000000000000 13 3 O00000000000000000 10000000000000000 0000000000000 000000000 Q0000000000000000000 2000000001000000000000000000000000000000 Q000000000000000000 300000000 Flap Damping Algorithm O0 0000000000000000 Q0000000000000000000000O 42 3 UUUUUUUUUUUUL Q000000000000000000000d e 000000000 up down e UUUUUUUUUUUUUUUUDUUUUUUL up down00000000000000000000000000 Q00000000000000000000 440 Q000000000000000000000000000000000000000 Q000000000000000000000000000000000000000 Q000000000000000000000000000000 0000000000000000000000000000d 0000000000 00000000 00000000000000 450 Q000000000000000000000000000000000000000 go 000 00000000000 0SPF000000000000000 Q000000000000000000000000000000000000000 111 1111 111 1111111111111141111411111 es 000000000 es 11111 1 1 Q00 2 90 Q000000000000000000000000000000000U000 Q000000000000000000000000000000000000 0000000000000 0L6SSAG0 00000 000000000000 Q0000000LSsA TO 000 000000000000 00000000 Q00000000000L6SSAT 0000 0
8. Down U UUUUDUUUUUUUUUUUUUUUUUUUUUUUUUUUUU Q0000000000000000000000000000000000 42 Q000000000000000000000000000000000000 LSSA Q000000000000000000000000000000000000000 11111111111 11 e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d Q00000000000000000000000000000000 4 22 UIUUUUUULU UUIDDUDUDDUDUDUDGUDDBDDUDUDUDDBDUDDUDUDUDUDUDBDUUUDUDUDUDBDUDUUUUDU Q0000000000000000 430000000000000000000000 Q0000000000000000000000000000000000000000 OOOO upQ 0000000000000 0 DO TO DOO 11710117117 11711 000000000000000000000000000000000000 Up Down Q000000000000d data value Threshhold
9. Flap 33 MANETUUUUUUUUUUUUL UDUUUUUUUUUUUUUUUUUDUUUUUUUUUUUUUUUUUUU Q00000000000000000000000000 0000000000000 Q000000000000000000000000000000000000000 MANET Wed dd 0000000 70000 MANETP OO 0000000000000 Q000000000000000000000000000000000000000 0000000000000 Q00000000000000000000000000000000000000 Q000000000000000000000000000000000000000 Q000000000000000000000000000000000000000 Q000000000000000000000000000000000000000 Q000000000000000000000000000000000000000 34 000000000000 Q00000000000000000000000000000 Q00000000000000000000000 MWD Modem Watch Dog 9 OO DOMWDBODDOD 000000000000 000000000000 000000 UDUDUUUUUUUUUUUUUMWDUUUUUUUUUUUUUUUUU e SYNC 000000000000 e AGC Automatic Gain Control 00000 e C N D0000000000 e Eb N0 1000000000000000 e TxFreq RxFreq 00000000000 sfc udl recv ai3 net 1 Fri Sat sun Mon Tue Wed AGC Min 43 8 Max 45 9 Avg 44 2 Cur 44 6 B C N Min 10 8 Max 12 4 Avg 12 0 Cur 11 8 32 MWDDIODUBDUDOLUU UL 3 5 UUUUUUUUUU 31000000OSPFOUOU0O00000000000000000000000 Q0000000000000000000000 Hello Interval OO 0 000 Hello 9 Interval 00 0000000 20000000000000000 3200000
10. 1 lll m Es EI m E Lr rr Q0000000000000000000000000000000000 UUUOOU000000000000000000000000000000 0 Q0000000000000000000000000000000000 0 Q0000000000000000000000000000000000 0 Q0000000000000000000000000000000000 0 DU UOU0UOU0U0u000000000000000000U00000000 U LSSA O D0000LSsAD00000000000000000000d 0 Q0000000000000000000000000000000000 0 Q00000000000000000000000000000000000 0 Q0000000000000000000000000000000000 0 1 Dampening Algorithm 0 00 00 000000000000 UUDUDUDBDUUDUDDUDDBDUDUDUDUDUDUUUDUUDDUUDUDBUDDBUUGuUDDuLDL U Operating System 00 00 000000000000000000000 m E gt 0 40 10 e ESTE EST 0 EV EL EZ Q0000000000000000000000000000000000 Q0000000000000000000000O Q0000000000000000000000000000000000 Q00000000000000000000000000000000000 ELCH EL ELE ET Ei EI ET 100 IO 3 1 EL EI E OOD TEST ET EZE 00 ET ET EL E EE ESI TET E 8 2 UUUUU Q000000000000000000000000000000000000000 Q000000000000000000 32 82 1 UUUUUUU Q00000000000000000000000000000000000000d Q000000000000000000000
11. Q00000000000000000 00000000 000000000000000 Q0000000000000000000000000000000000000O Q00000000000000000000000000000000000000d Q0000000000000000000000000000000000 Q000000000000000000000000000000000d Q0000000000000000000000000000000023 1111 EVE L1 E L1 22 O0000000000000 Q00000000000000000000000000000000000000d Q0000000000000000000000000000000 00000000000000000000UP D0WNO 0000000000000 Q0000 0000000 TO TOTO 00000000000000000 Q000000000000000000000000000000000000000 Q000000000000000000000000000000000000000 Q000000000000000000000000000000000000000 Q00000000000000000000000000000000000000 Q000000000000000000000000000000000000000 Q000000000000000000000000000000000 Q0000000000000000000000000000000000000d Q0000000000000000000000000000000000 UP 00 Q000000000000000000000000000000000000000 Q000000000000000000000000000000000000000 Q000000000000000000000000000000000000000 Q000000000000000000000000000000000000 0000000000000 0000000000 0000 00000000000 Q000000000000000000000000000000000000000 Q000000000000000000 2 8 Q00000000000000000000000000000000000000d Q000000000000000000000000 210000000000000 Q000000000000000000000000000000000000 Link Reachiability a ES D State UP OWN 0 214 0000000000 Q
12. 0 as Satellite Link 10 0 0 1 30 Router B SE E o ajas LSSA 71 00000000 73 734 gsu 11110111111 Q00000000000000000000000000 UUDDDUDUDDUMWDDDUDUDDDUDDDUDBDUDUDUUDBDDUDDD 100000 0 0 11111711111 Q00000000000000000000000000000000 7 3 2 UUUUUUUUU 5000000000000000000000 7 3 3 DOOOOOGO 11110111111 11111711111 11111711111 Q000000000000 11711171111 Q0000000000000000000000000000000000000O Q00000000000000 30 11111111111 e Interface up down e OSPF cost D uuu Q0000000000000000 000000000000 000 0000000000 0000000000000 Q000000000000000000000000000000 UUUOUOU0O00U0000000000000000000 LSSADODODOCOCODODOOOO 2004 01 09 11 17 30 gt up 2004 01 09 11 17 30 gt up 2004 01 09 11 17 30 gt up 2004 01 09 11 17 30 gt up 2004 01 09 11 17 30 gt up 74 UUUUUU connect from connect from connect from connect from connect from Accepted from Accepted from Accepted from Accepted from Accepted from Q000000000000000000000000 31 127 0 0 127 0 0 127 0 0 127 0 0 127 0 0 1 1 1 1 1 OOOOOGOOCOOOOOOOOOOOOOOOOOOOCOOCOOOOOOGO Q000000000000000000000000000000000 dowe 0O 49182 49183 49184 49185 49186 8
13. 00 Fp9o00000000000000000000 Q00000000000000000000000000000000 EL E DU Uu Q0000000000000000000000000000000000000 Q0000000000000000000000000000000000000 Td TO O OO TO TO TOTO TO TONDO 0O0O Q0000000000000000 10 11711111111 DUBBI 141 UUUUUUO Q000000000000000000000000000000000000000 Q00000000000000000000000000000000000000d 41 UUUUUUUUUUUUUUU Q00000000000000000000000000000000000000O Q000000000000000000000000000000000000000 Q000000000000000000000000000000000000000 11111111111 OOOO LSSA Link State Sense Agent Q0000000000000000000000000000000 410000 Router Routing Daemon dita link status determine data link status LSSA get data link status inform the DataLink Layer2 Modem 41 000000000000000 11 411 UUUUUUUUUULU UUDDUDUDDUDUDUDGUDDBDDUDUDUDUDBDUDDUDUDUDGUDDBDUUUDUDUDUDBDUDUUUUDU Q000000000000000000000000000 420000000000 Q000000000000000000000000000000000000000 Q00000000000000000000000000000000000000d 4 1 2 UUUUUUUUU Down 00000000 Q0000000000000000000 Down DU 00 0000000000 Q00000000000000000000000000000000000000d Q000000000000000000000000000000000000000 Q00000000000000000000 Q00000000000000000000000000000000000000d
14. 00000000000000000 000000000000 O TO TOO TOT Q000000000000000000000000000000000000 Q000000000000000000000000000000000000 Q000000000000000000000000000000000U000 Q000000000000000000000000000000000U000 11111 EH E EEE EV EEE L1 0 0 EE 14 check the satellite datalink gettito check the satellite datalink ps auf mas 0 44 000000000 downQ O00 15 check the satellite SL uy datalink check the satellite datalink mte 45 000000000000 16 51 1 0000000000000 LSSA Link State Sense Agent L D D 5 1 DODO Q0000000000 4000000 LSSAJIIIU UL Q00000 51100 0000 8000 800080008000 0 Connection via the I 0 51 00000000000 17 511 UUUUUUUUUU OOOOOGOOCOOOOOOOOOCOOOOOOOOOCOOCOOOOOOGO Q000000000000d e AGC Automatic Gain Control 71111101711 00000000000000000000000000000000 00000000
15. 000000000000000000 9101100000 822 UUUUUUUUUUUUUUNUL Q000000000000000000000000000000000000000 00000 up down O D00000000000000000000000000020 Q000000000000000000000000000000000000000 Q00000000000000000000000000000000000 8 2 3 000 Link 00 000000000000000000000 OOO Liik000000000000000000000000000Flap Damping Algorithm 0000000000 Link up D Link down OOO 2000000000 D Uu Flap Damping AlgorithmQ 00 00 0000000000000000000000 Q00000000000000000000 Suppress Limit 4000000000 D down 0 O 0 Reuse Limit UD 00000000000 00000000 Q0000000000000000000 Han 0 UU OOOO Link 1 Link down 00 2000000000000000000000 Q000000000000000000 Link Down UD DUDU DU Link Up 000 Q000000 Link 00 UD DUDUDUD DUDU DUDU down UU 000 Link UP 00000000000 21 UUUUOU0O00000000000000000000000000000FapD0D 1111 UU2000000000000000000000000000 33 34 1 1 E J Moy OSPF Version 2 March 1994 RFC 1583 G Malkin RIP Version 2 Carrying Additional Information January 1993 RFC 1388 Y Rekhter and T Li A Border Gateway Protocol 4 BGP 4 March 1995 RFC 1771 Anindya Basu Jon Riecke Stability Issues in OSPF Routing ACM SIGCOMM August 2001 C Villamizar R Chandra and R Govindan BGP
16. 00000000000000000000000000000000000000d Q0000000000000000000000000000000000000000 Q000000000000000000000000000000000000000 Q000000000000000000000000000000 0000000000 5 Q000000000000000000000 31711117717 Q0000000000000000 3 1 Hello Interval Time U OSPF Hello Interval 100000 Hello Interval 00000000 1 Hello Interval OO 11 0 00 Q00000000000000000000000000000000000000O 0000000000000 00000D0OUHello D D D U 0000000 0 0 DD DD Hello Internal Hello Interval T 0000000000000000 31000000000 DO 3 1 Hello Intervall 000000000000 Hello Interval O O 10sec default 33sec 500msec 2sec 250msec 1500 O O O Hello Interval T 000000000 Route 00000000000 Route 71911111111 UU Route 0000000
17. 00000000000000000000000050 e C N Carrier to Noise Ratio 00000000000 00000000000 DO00000000000000000000 e RSL Receive Signal Level DO00000000000000000000 e Eb NO0 Ratio of Energy per Bit to the Spectral Noise Density IUUUUDUUUUUUUUUUUUUU DUO00000000000000000000 5 2 LSSAQ OQ ESSAD ODO 0000 00000000000 e 000000000 e UDDUUDDUDDUUUUDDU DUU Q000000000000000 Q00000000000000000000000000000000000000 Q00000000000000000000000000000000000d 5 3 0000000000000 Q000000000000000000000000000000000000000 QO000O 18 gt ta MAA JN e OE ere oo le a 2 Carrier i Power Average C N Noise Average _____ YVA i frequency Hz I 5 2 19 5 3 1 00000000 O000000000000000000003400000 MwD0000 00 MWD Q000000000000000000000000000000000000000 LSSA 0 0 1110 08 3000000000000 5 32 UUUUUUU 1 Data Collect Module O DCM DCMPO 0000000000000 530 8 e 000000 000000000 e 000000 000000000 e 0000 e 0000 e Sync Carrier Detection e Eb NO e Automatic Gain Control 200000000000000000000
18. 05 1052000000000000 Q000000000000000000000000000000000000d O 5 1 1 DD D Tva test Table ts dsync rsl ebno agc 1072373597 OK 30 2000 15 5000 NULL 1072373566 OK 30 2000 15 6000 NULL 1072373525 OK 36 6000 15 5000 NULL 1072373484 OK 36 2000 15 5000 NULL 1072373442 OK 36 4000 15 6000 NULL ocMOO30OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOA 000 30000000000000 SYNC RSL Eb N0g D 0000 54 000000000 Q00000000000000000000000000000000000000 Q0000000000000000000000 20 Satellite Modem Insert to DataBase MWDS Raw Data from DataBase Raw Data to Judge Module ne um HN data link status Dampening m up or down information LSSA after Judging pu Reflector i Daemon up or down Information 53 MWDBpo0000000000 21 MWD I 0 U S test Table 5 2 ts mfreq mtype mrate mpower dfreq dtype drate 8P23 1536 0000 13 5000 66 0000 8P23 512 0000 65 2500 1052164176 8P23 1536 0000 13 5000 66 0000 8P23 512 0000 65 2500 1052164211 8P23 1536 0000 13 5000 66 0000 8P23 512 0000 65 2500 1052164247 8P23 1536 0000 13 5000 66 0000 8P23 512 0000 65 2500 10521642
19. 82 8P23 1536 0000 13 5000 66 0000 8P23 512 0000 65 2500 1052164318 541 00000000 Q000000000000000000000000000000000000DCM Q000000000000000000000000000000000000000 Q000000000000000000000000 Q00000000000000000000000000000000000000 Q0000000000000000000 Q000000000000000 0000 0000000000 00000000000 EE 55 UUUUUUUUUUUUUUU 0000 0000000000 0000000000000 11111 551 UUUUUUUU Q000000000000000000000000000 eHO0000 0000000000000 up down e osPFOOOOO RIPQOD ODO 0000 00000000000 Q0000000000000000000 up dowag 0 0 D Q00000000000000000000000000000000000000 Q0000000000000000000000000000000000 54000 Cup or down LSSAT OO 0000000000000000000000000000000000 Q0000 up 0000000000000000000000000 dowe 000O 22 e Routing Daemon Routing Table Dampening Data retrieving LSSA Algorithm program 05 D 54 LSSADODODOOOOO Q00000000000000000000000000000000000000d 11111111111 11 23 61 LSSA III
20. ADO AHS TRTE BETES BN 11111111111 11111 1111114141 kuma sfc wide ad jp DOOD UU 0 00160 10 150 Q0000000000000000000000000000U000 Q0000000000000000000000000000000 CCIE ELE EE EL EL EI EL E EE EIS ELE E E El L1 L1 L1 L1 L1 E L1 L1 E L1 L1 L1 EJ L1 Ed L1 E L1 E L1 L1 EJ L1 L1 L1 L1 L1 E L1 L1 77177171177 177 Lr rr Lr rr Q0000000000000000000000000000000 LJ EJ EA E ET ET EE a a e SEM EEC 0 061 4 EL EL L E CH LTL E ES EE EIS ET ENEE ORDER E EI EI EL ELL ET a ef es 7 fl E3 E3 O ET E73 14 04 0000 EL EST E ETS 104 0 00 EI O O E O O O E O O O O Oo O O O ES O O O O O O O O O O O O O O ES O EE Ed a m U uuu 190000000200000000300000 Abstract In this research the system in which monitors the link condition of dynamic routing in satellite links is designed and implemented Current system of monitoring link condition under routing mchanism is simple and that it determines whether the state of a link is available for connection
21. EE s nii went OS R A 25 EE a did E s 30 ili 0 3 1 5 1 5 2 6 1 7 1 Hello Intrvalg 0000000000000 7 MWDODOOOOCOOOO D vstest Table 20 MWDIDDHDHDDDD 0 fstest Table 22 pss p acetal eta de aa as Ee aue 24 Tide rido O 000000 29 11111117717 11 000000000000000000000000000000000000000 0000000000000000000000000000000000000000 0000000000000000000000000000000000000000 0000000000000000000000000000000000000000 000000000000000000000 00000000000000000 0000000000000000000000000000000000000000 00000000000000000000000 000000000000000000000000000000000000000 0000000000000000000000000000000000000000 0000000000000000000000000000000000000000 0000000000000000000000000000000000000000 0000000000000000000000000000000000000000 0000000000000000000000000000000000000000 00000000000000000000000000000000 000000000000000000000000 ADSL WDMI Ethernet ATM 0000000000000000000000000000000000000000 0000000000000000000000000000000000000000 0000000000000000000000000000000000000000 0000000000000000000000000000000000000000 0000000000000000000000000000000000000000 0000000000000000000000000000000000000000 0000000000000000000000000000000000000000 0000000000 000000000000000000000000000000000000000 00000000000000000
22. It sends out monitor ing packet periodically and estimate that the link is disconnected when the reachability is not available for set amount of time Because of it some trouble occurs Such problems are mis detection of link conditon andunsupported datalink specification For example unusable link is selected as a routing path and generates time delay for switching its path Also although datalink stores various parameters depending on communication media Existing link monitoring system only checks weather the packets had flow through the link For satellite link other than availability of link there are other parameters such as level of reception and noise ratio exists In order to solve this problem new link monitoring system is needed In this research system that accurately reflects datalink conditions to routing policy is designed and im plemented This system captures datalink conditions that were not supported in existing system and utilize its data as a baseline for checking if the link is available In accordance to captured data and policy Routing policy is reflected in following order First capture some datalink information from satellite modem Compare captured data with thresh old and check if datalink connectivity is available Reflect result to the routing policy This system provides function of reflecting link condition to routing policy instead of Operating System As a result without large modifications of existing routin
23. Route Flap Damping November 1998 RFC 2439 Y Ohara M Mhatia O Nakamura and J Murai Route Flapping Effects on OSPF SAINTOS Workshops pages 232 237 January 2003 IETF MANET WG Mobile Ad hoc Networks http wwww tetf org html charters manet charter html OO 00 000000000000000000 APFS 70985 00000000 pages 53 62 107 116 1998 K Kataoka H Watanabe and J Murai Data Link Monitoring on the Satellite Based Network in the Internet SAINTOS Workshops pages 35 40 January 2003 Mysql home page http www mysql com Zebra home page http www zebra org 35
24. g protocol and routing system this system achieve appropriate selection of route path using link information In this research incorporation of datalink condition into link monitoring system of routing provides stabilized path selection in network including satellite link Keywords 1 Routing Protocol 2 Data Link 3 Satellite Link E 2 2 2 3 30 3 1 3 2 3 3 3 4 3 5 4 4 1 4 2 51 5 1 5 2 uU HAD DE sapa pes 2 1 ENEE ee EO ardt Rit 2 2 RIP oh ul Et AH as en aB 214 00000000000000 25506000 ehe Ser doi mme d Ei REDE ORA GA Ee PE O JUDO O O O Hello Interval Time OOO OSPF O O O Route FlappingH 1 2 2 MANET BE pu a S Ron AN E eoo rm ee eee uud OU yanasa t A en Aii OAT MT 444 4 i 412 000000000 Down000000000 EEE E esta rss oom E 421 0000000000000 cesar taa 422 00000000 423 0000000000000 A o aoaaa anaana 79941 OG UDAL LE St DADO o acit paya ano ESOS vz a e DS as E O 5 9 5 4 8 9 U 60 6 1 6 2 6 9 0 4 0 5 6 6 6 7 7 1 7 2 7 3 7 4 8 1 8 2 Td
25. req modulator freq char mtype 8 modulator type unsigned double mrate modulator rate unsigned double mpower modulator power unsigned double dfreq demodulator freq char dtypel8 demodulator type unsigned double drate demodulator rate data fs test struct data vs test 1 int ts time stamp char dsync 5 OK or NULL double rs1 Receive Signal Level double ebno BitEnergy to NoiseRatio double agc Auto Gain Control 6 5 UUUUUUUUU mysql library data fs test O O data vs test 00000000 66 UUUUUUUUL 6 61 DDD OOOOOOGOOOOOOOOGOOOOOOOOOOOOOOOOOOOOOOOOG Q000000000000000000000000000000000000000 pogo do 00 000 Q0000000000000000000000000 175 4171117 11711 26 67 OOOOOOOOOOOOOOO 0 0 up down0000000 11111111111 20000000000 DU Q000000000000000000000000000000000000000 1111 6 7 1 OOOOOGOOCOOOOOOOOOCOOOOOOOOOCOOCOOOOOOGO go 0000000 0000000000000 6 72 000000 ESSAD ODO DO Dodo 00 000000000000 O zebra D zebra ioct c0 0000000000000 if get flags D O O ssa client D D LSSA
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