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1 5 161

2

3 1 1.1 DDT WG DDT WG 1. \DDT" 2. DDT WG DDT WG 1.2 x ( IP) y ( X.25) x y \x overy" x y 1.1 IP X.25 IP IP IPX Appletalk OSI IP \encapsulation" \encapsulation header" \decapsulation" 163

4 WIDE TCP/IP network TCP/IP network IP TCP Data IP TCP Data X.25 IP TCP Data X.25 network 1.1: TCP/IP over X \IP in IP" (ipproto=4) IPng IP (IPv4) IP (IPng) IPv4 IPng \IPng over IPv4" IPng IPv4 [64][65] IP \IPX over IP"[66], \OSI CLNP over IP"[67][68] GRE (Generic Routing Encapsulation)[69][70]

5 [71] (Mobile Host: MH) MSR (Mobile Support Router) \IP within IP" (ipproto=94) 3. forwarding [72] [73] IDRP AS border gateway [74] AS AS IP [75] \IP over IP" \Internet Encapsulation Protocol"[76] \PPP over TCP" [77] 4. IP option IP IP option TP-num

6 WIDE 1. TTL 1 MTU MTU MTU [78] 2. QoS QoS (Quality of Service) QoS 3. packet lter 4. ( ) cost/metric 5.

7 5 167 [76] 6. CPU 7. MTU MTU MTU MTU (Layer Violation)

8 WIDE DDT WG 2 \DDT" TP-10 \DDT" \DDT" 3 TP-9 TP-1, TP-2, TP-3, TP-4 TP-5, TP-6, TP-7, TP-8 4 DDT \DDT" \DDT" \DDT" 5 DDT WG '94

9 2 2.1 DDT Ethernet \DDT" 1 DDT DDT 2.1 \IP over IP" DDT H a H b H a, H b P a, P b V a, V b N v H a, H b 2 N v V a, V b N v N v 2.1 H a H b IP N v H a (\DDT") N v V a V b TCP H b (\DDT") H b 1 DDT \Doki Doki Tunneling" \Delightfully Dangerous Tunneling" 169

10 WIDE Ha Hb Application Application Transport (TCP) DDT pump DDT pump Transport (TCP) Network (IP) Network (IP) Ether DDT DDT Ether Na Pa Va Virtual Network DATA TCP IP (Nv) Vb Pb Nb DATA TCP IP IP Normal Internet 2.1: IP over IP DDT 2.1 H a ( \Network (IP)") DDT (\DDT") IP (\DDT pump") (\Ether") (\N a ") 2.1 P a P b N v H b (\Ether") (\Network (IP)") DDT TCP rewall

11 5 171 Bypass Network Internet G Firewall Gateway Organization Network G Isolated Gateway Isolated Island 2.2: DDT DDT DDT DDT rewall DDT ( 2.3 )

12 WIDE H Firewall Router GW Global Internet Addres Space DDT Virtual Network Physical Network Private Address Space Ha Hb 2.3: DDT H Firewall Router Imaginary Host Imaginary NAT Ha Communication Real Communication Ha Mapped by NAT Real Host 2.4: NAT NAT (Network Address Translator)[79] DDT NAT rewall NAT NAT NAT DDT ( 2.4 )

13 A Secure Virtual Network DDT DDT secure TOS[80] rewall DDT DDT 2 Ethernet OSI 2.3 BSD DDT DDT BSD tahoe BSD Networking Software Release 2 (NET2) BSD 4.3BSD 2.5 [81]

14 WIDE trap ) ) ) 2.5: 4.3BSD OSI 7 TCP XX output() XX input() XXintr() XX intrq ( )

15 5 175 Socket Layer Protocol Layer tcp_output in_ddt_output in_ddt_input tcp_input ip_output ip_output ipintr ipintr Interface Layer ddt_output IF_output IF_input ddt_input HARDWARE 2.6: DDT BSD ddt output() 4.3 BSD ddt input() ( ) in ddt output() in ddt input()

16 WIDE DDT MTU next hop MTU next hop MTU MTU 0 next hop MTU \The Path MTU discovery algorithm"[82][83] \IP MTU Discovery options"[84] An Unnumbered Link DDT N a N b DDT N a subnet N b DDT N a N a subnet N a (1) subnet default (2) CIDR[85] (3) "unnumbered link" (3) \unnumbered link" H a H a P a H b P b (ifcong) P b P b

17 5 177 Application Daemon TCP IP Ether IF_tun /dev/tun0 Ethernet 2.7: Pnet unnumbered link 4.3BSD tahoe unnumbered link IFF UP o Pnet DDT Pnet[86] 2.7 Pnet Pnet tunxx /dev/tunxx IP tunxx /dev/tunxx /dev/tunxx tunxx IP ptyxx ttypxx Pnet Pnet DDT

18 WIDE DDT \unnumbered link" Pnet

19 3 (TP-9) Layer Violation SAP (Service Access Point) System V STREAMS 3.1 IP

20 WIDE TOP: Information RFC822 SMTP TCP IP Encryption IP MAC RFC822 SMTP TCP IP MAC Compression Encryption BOTTOM: Device STACK Available Protocols 3.1: \IP" STREAMS ( OSI 7 ) 2 3 \view" view view view 3.3 view

21 5 181 src dst ATM Information RFC822 SMTP TCP IP Encryption IP Ether FDDI Ether : (2 ) : ( ) 3 3.2: Information RFC822 Application Transport Internet interface SMTP TCP IP Encrypt IP Ether Application Transport Internet interface view-a STACK view-b 3.3: \view"

22 WIDE (TP-9 ) (TP-1, TP-2, TP-3) (TP-4) (TP-1, TP-2, TP-3) 1. (TP-1) (2 TTL ) 2. (TP-2) (2 QoS ) 3. (TP-3) (2 )

23 Connectionless Connection-Oriented Connectionless Connectionless 2 3 TTL, QoS, ID ( ) TTL, QoS, ID TTL TTL TTL TTL TTL 2. 2 QoS QoS QoS 3. 2 ( ID ) ID ID TTL, QoS, ID 3 ID Connection-Oriented Connection-Oriented 2

24 WIDE 1. 2 TCP Connectionless 2. QoS ftp port TOS 3. QoS ID QoS ID ID : x y x y 1. 2

25 (TP-4) : x y x y Ethernet IP IP Ethernet cost/metric up/down 2 TP-4

26 WIDE x y x y 1-2 \down" 1-3 \down" \down" Distance Vecotr Link State 3.3 TP-5, TP-6, TP-7, TP-8 (TP-5) (TP-6) CPU IP [87] MTU MTU (TP-7) MTU MTU [82][83][84]

27 5 187 MTU MTU MTU 0 (TP-8)

28 4 DDT DDT DDT 4.1 { { { / { { { DDT Short Term ( ) 188

29 5 189 DDT 4.2 DDT DDT DDT 1 3 DDT DDT DDT (Firewall) 1 WIDE

30 WIDE : ISDN DDT 2 3 IP TTL MTU ICMP ICMP ICMP : telnetx ftpmail IP TTL : udprelay DDT DDT DDT

31 / / 2. 1 DDT 2 DDT DDT DDT DDT

32 WIDE 4.4 DDT DDT DDT DDT

33 5 DDT WG ' DDT WG { { CIDR skip { { DDT { 3 { 3 IP { 3 { (TP-8) 193

34 WIDE

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