ITAOI2003第三屆離島資訊與應用研討會論文範例
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- きみえ おとじま
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1 kung@mail.npust.edu.tw, b @mail.npust.edu.tw, m @mail.npust.edu.tw (Internet) and build up cache proxy servers. In this paper, we (Multi-media) design and development four proxy servers to achieve the functions, which are the load balance, 寛 (Delay) technologies achieve high access rate, high performance, and stable connection quality. The (Cache Proxy Server) proposed deployment schemes is based on the adaptive routing table to turn up peer access and the (Cache) access control list in squid daemon. Keywords: Cache Proxy Servers, Fault Tolerance, 寛 (Routing Table) Squid (Peer Access) (Client) (Browser) (Access Control List, ACL) (World Wide Web, WWW) (Load Balance) (Fault Tolerance) (Distributed) (Load Sharing) 1 Abstract As the rapid deployment of broadband Internet, multimedia presentation is required. However multimedia communications speed high bandwidth to transmit information. Furthermore, the limited bandwidth is not enough to support traffic requirement the peak. There are two solutions to solve this problem, which are to expand bandwidth fault tolerance, distributed and load sharing. These Load Balance, Distributed, Load Sharing. Internet (Multi Router Traffic Grapher, MRTG) Mb/ 52Kbps/ 81Kbps/ 30Kbps/ (Local Area Network, LAN) 364
2 1 (Cache Proxy Server) 寛 (Route) (Load Balance) (Fault Tolerance ) (Distributed) (Load Sharing) (i) (Proxy Server)(ii) (Asymmetric Digital Subscriber Line, ADSL) (Proxy Server) (Client) HTTP (Server) (Request) (Response) (Caching) (Text) (Image) (Web) (Hyper link) 1. 2 WEB (Request) WEB WEB (Cache) (Cache Hit) Cache hit 3 365
3 Parent Proxy Child Proxy ICP Query 2 (i) Proxy Server ICP Query Sibling Proxy 3 (ii) 2. Subscriber Line, ADSL) (TANET) 1 Internet Internet Cache Protocol (ICP) WEB (Request) URL WEB [3] (1) (Parent) (2) (Silbing) (3) (Child) [2] 4 (ADSL) ICP Silbling Parent ;Silbling Parent ADSL ATU-R (Splitter) 4 Proxy ; Parent (Peer Access) (Hit) (Asymmetric Digital / 5 ADSL ATU-R 366
4 ADSL splitter ATU-R DSLAM ATM 5 ADSL ADSL ADSL 6 ADSL ATU-R ADSL ADSL ADSL Alteon (Load (Layer 4 Switch ) (Load Sharing) Proxy Server HTTP HTTP Routing Table (Load Sharing) [5] Proxy Server (1) (2) (3) Access Control ListRouting TablePeer Access 6 CISCO 7513 (Direct Access) (TANET) Router (Peer Access) (Load Sharing) ALTEN 180e 10 (LAN PORT) LAN PORT 1000Base-SX/LX Cisco2900 Cisco2900 Cisco2900 TANET Route Balance) SQUID (Load balance)[5] Access Control List (Direct Access) (Direct Access) (i) (ii) HINET TANET TANET HINET 367
5 (iii) lib-dn ACL 1 cache_peer proxy.nsysu.edu.tw parent no-query no-digest no-netdb-exchange cache_peer ccproxy.nsysu.edu.tw parent no-query no-digest no-netdb-exchange cache_peer proxy.hinet.net parent no-query no-digest no-netdb-exchange Proxy Server Access Control ListRouting Table Peer Access Access Control ListRouting TablePeer Access 1. (Access Control List, ACL) ACL dst ip-network/netmask. ACL dstdomain. 2 acl npust-ip dst "/etc/squid/npust-ip.txt" acl npust-dn dstdomain.npust.edu.tw SQUID 1 acl tw-ip dst "/etc/squid/tw-ip.txt" proxy.nsysu.edu.tw acl tw-dn dstdomain.tw acl foreign-dn dstdomain.edu.com ccproxy.nsysu.edu.tw acl HINET-dn dstdomain.hinet.net.seed.net acl lib-dn dstdomain "/etc/squid/lib.txt" proxy.hinet.net parent npust-ipnpust-dn lib-dn IP SQUID 3 3 always_direct allow npust-dn always_direct allow npust-ip always_direct allow lib-dn tw-dntw-ipforeign-dnhinet-dn SQUID ACL (Load Sharing) (Distance) hient Routing Table Peer Access Routing Table Peer Access dst 2. (Peer Access, PA) dst SQUID IP dstdomain (Distributed) 2 npust-ip npust-dn tw-ip tw-dn foreign-dn SQUID HINET-dn HINET 1 proxy.nsysu.edu.tw 368
6 ccproxy.nsysu.edu.tw proxy.hinet.net 4 4 cache_peer proxy2 sibling proxy-only cache_peer proxy3 sibling proxy-only cache_peer proxy4 sibling proxy-only 3. (Routing Table) Proxy Server (Routing Table) ICP Squid (Peer Access) (Access Control List, ACL) cache_peer_access Proxy Server 6 Cisco TANET Cache_Peer_Access (Default Route) tw-ip tw-dn proxy.hinet.net proxy.nsysu.edu.tw ADSL ATU-R foreign-dn ccproxy.nsysu.edu.tw 5 cache_peer_access proxy.hinet.net allow foreign-dn tw-ip tw-dn!npust-ip!npust-dn!lib-dn cache_peer_access proxy.hinet.net deny all cache_peer_access proxy.nsysu.edu.tw allow tw-ip tw-dn!npust-ip!npust-dn!lib-dn cache_peer_access proxy.nsysu.edu.tw deny all cache_peer_access ccproxy.nsysu.edu.tw allow foreign-dn!npust-ip!npust-dn!tw-ip!tw-dn cache_peer_access ccproxy.nsysu.edu.tw deny all ICP ICP (TANET) (Gateway) ( / ) HINET Gateway proxy.hinet.net HINET ICP ICP ICP 369
7 6 Kernel IP routing table Destination Gateway Genmask Use HINET proxy1.nsysu.edu.tw proxy2.nsysu.edu.tw HINET ccproxy2.nsysu.edu.tw ccproxy1.nsysu..edu.tw * * default eth1 eth1 eth1 8 Proxy2 ( ) ADSL Pwebstats HTTP Request (Cache Hit Rate) Request 35%30% Byte 23% 20% 9 Proxy3 10 Proxy4 7 Proxy1 proxy.nsysu.edu.tw ccproxy.nsysu.edu.tw ICP HINET proxy.hinet.net proxy.nsysu.edu.tw ccproxy.nsysu.edu.tw Cisco 2900 TANET squid (/var/log/squid/access.log) proxy.hinet.net 况 TANET 370
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