TCP/IP ????

1
TCP/IP ????

• ? 4? ??? ?? ????

2
5.1 Intorduction5.2 RARP packet
Format5.3 RARP ?5.4 RARP Server Design5.5 ??
? ?
3
Diskless system( X-terminal or diskless
workstation)? Disk? ???? ??? IP address? ??
?? ??? Network Interface??? ?? unique
hardware address? RARP Request? ???? ??? IP ???
??
5.1 ??
4
ARP? ??Frame type? 0x8035? op field? RARP
Request? 3??RARP Reply? 4??
5.2 RARP ?? ??
5
5.2 RARP ?? ??
RARP Request
A
B
C
D
Diskless System
Diskless System?? ??? IP Addr.? ???? ???
Ethernet Address? ??? Broadcasting
6
5.2 RARP ?? ??
RARP Reply
RARP Server? ??? Ethernet Address? IP ??? ????
host? /etc/hosts, /etc/ethernet? ???? ??? Reply
7
1 0.0 80203f642
ffffffffffff rarp 60 rarp
who-is 80203f642 tell 80203f6422
0.13 (0.13) 00c06f2d40 80203f642
rarp 42 rarp reply 80203f642 at
sun3 0.14 (0.01) 80203f642
00c06f2d40 ip 65 sun.26999 gt
bsdi.tftp 23 RRQ 8CFC0D21.SUN4C RARP ???
?? ????? RARP Request? ???? ? Request? ????
timeout interval? ?? ???
5.3 RARP ?
8
System dependent and complex RARP Servers and
User Processes RARP mapping( hardware -gt IP
address)? ?? ??? ??(/etc/ethers)? ?? kernel?
disk file? ?? ???? ??? ????? RARP server?
????? ? RARP server? RARP ???? ?? ?? ?? ? ??
??? ??(systemdependent)
5.4 RARP ?? ??
9
Multiple RARP Servers per Network RARP
Request? hardware level?? broadcast???
diskless system? ?? ?? ???? ?? ?????
Redundancy? ???? ?? ?? ?? ? ?? ? ??? ?
??? diskless system?? ???? ???? ??? ??
?? 16? BOOTP
5.4 RARP ?? ??(??)
10
RARP? ????? ???? ?? ???? ??? IP ??? ?? ??
??RARP Packet??? ARP Packet? ?? RARP???
?????? RARP??? ?????
5.5 ??