 ȭ   Ͽ
 Firewalling and Proxy Server HOWTO
 David Rudder, drig@execpc.com : , sudoer@nownuri.net
 v0.2, 17 July 1995

  PC   ȭ  ⺻ ġ  
Ǿ.  ȭ  Ѿ ͳ  ִ  
 ġ  Ŀϰ ִ. 

1. Ұ
ȭ ͳ  ñ ·μ ֱ   Դ. 
  ͵ ׷ϵ    ظ  Դ.  Ͽ  
ȭ̶ , װ  ϴ,    , 
װ  ϴ  ⺻  ٷ ̴.   о߰ 
ƴ ٸ     α׷ ؼ ٷ ̴. 

1.1 ǵ
 ǵ鵵 ȯѴ. Ųÿ   ϱ  Ư Ų
 ڷκ ǵ ٶ ִ.   Ȯ   ִ
 ε  ˷ֱ ٶ!!  ̹Ƿ Ǽ   ִ. 
 Ǽ ߰  װ͵ ġ   ְ ſ̴.  
 ڿ   Ϸ  ̳,  ٻڹǷ Ȥ   
ߴٰ ؼ    ٶ. 
 ڿ ּҴ drig@execpc.com̴. 

1.2  
  ȭ    ۵ϴ°  Ұڷμ 
ǹ̸ Ѵ.    ƴϸ  ü  ʴ´. 
 ٸ 츶 ǻ͸ ϰ    å    ʴ
.    ٰ    ջ ؼ å 
 ʴ´.      ģ  ֱ  
̱   ̴.    Ȯ  λ ΰ  
ʴ.

1.3 ۱
ٸ  ٸ,  Ͽ ۱Ǵ ޴ ڿ ־
.  Ͽ  纻  ۱ǰ Ǵ , ü 
 κ   Ǹ,  Ǵ    
Ǿ .   롤ݷȴ. ׷  
 ڴ  Ѵ. 

    ̶  ϴ ۾ Ǵ, װ 
 ۾ ۱ǰ ˷ Ͽ ̷ Ѵ. ٽ , 
  Ѽؼ ȵǸ װ ÿ װ ̰ ȾƼ ȵȴ. 
  ܴ Ư ǳ ޾Ƶ鿩; Ʒ ּ  ڵ
Ϳ  õ϶.
ϸ,   ä ؼ    Ȱ⸦ 츮 
Ѵ. ׷, Ͽ  ۱ǰ ֱ⸦ ٶ, Ͽ 
    ȹ̶ 츮 ˷⸦ ٶ. 
 ִٸ, David Rudder  ϶.
 <drig@execpc.com>.

1.4    
  Ⱓ comp.os.linux.*  а ȭ  û 
ӵǾ. Դ ġ ƹ  ַ ʴ  ó .  
 ƹ  ؾϴ  ̶ Ѵ. ׷Ƿ, 
ȭ    ð , θ ߴ.   ׷ 
 û鿡  ̴. 

1.5 ؾ  
 Ų 󿡼 ̰  Ǵ° Ѵ
 ٸ windows tcp/ip Ű Ѵ
  ȣȯǴ Ǹ UDP   ã´

1.6  о   
 tis ȭ Ŷ  
 net-2 Ͽ 
 ppp Ͽ 
 ̼Ʈ Ͽ 
 multiple ̼Ʈ Ͽ 
  Ʈŷ 
 O'Reilly and Associates簡  TCP/IP Network Administrator's Guide
 
tis ȭ Ŷ ȭ       
 ִ. ȭ Ŷ     ȭ Ʈ   
ã ƶ. 

2. ȭ 
ȭ̶  ڵ  κ ±  Ǵ ̴. ڵ
 ȭ̶  Ƿκ   иϱ   ġ
̴. װ͵ ڵ ߽ÿ ° ȣϱ  ǵ Ǿ. 
ǻͿ ȭ κ  Ʈũ ȣϴ  ġ
̴. 
ȭ ۵:
1. ( ڽ ó)  ɷ  ǻ͸ ´. 
2. 2 ̽ ִ´. (ø Ʈs, ̼Ʈ, Token Ring ..)
3. ip forwarding Ѵ. 
4. ϳ ̽ ͳݿ Ѵ. 
5. ٸ ̽ ȣ Ʈũ Ѵ.

, ϳ ǻ͸ ϴ 2  Ʈũ  ȴ. ȭ 
ǻʹ , δ ׳ "ȭ"̶ Ѵ, ȣ޴ Ʈũ ͳ  
 ο  ϴ. ȣ Ʈũ ͳݿ  ȵǸ, 
  ȣ Ʈũ   .
 ȣ Ʈũ ηκ ͳ  Ϸ, telnet 
ȭ   װκ ͳ ؾѴ. , ȣ޴ 
Ʈũ ϱ ؼ ݵ ȭ ľ߸ Ѵ. 

̰ ͳκ ݿ  پ ȱ  ش. 
ȣ޴ Ʈũ   Ϸ Ѵٸ, ݵ ȭ ļ 
ϸ, ̰   ְ   ư .  ȣ޴ 
Ʈũ  ź  Ǵ "ͳ worm"  Ϲ  
 Ѵٸ, ׵ ȣ޴ Ʈũ    ̴. ̰ پ
  ش. 

2.1 ȭ 
ȭ  ū  ȭηκ ͳ  Ѵٴ 
̴. ⺻, ׵ ̾ shell   ͳ  
. ݽó ͳ   䱸ϴ α׷ 
ȭ ڿ ۵  ̴.    ذå  
  ̴. 

2.2  
  ȭ Ѿ ͳ  ϴ 
. ׵  ִ      ͳ 
communication Ѵ. ,  ǻ , drig(۰ ̵ 
ϴ) ȣ޴ Ʈ ʿ , ݽ Ͽ  ˻ 
ʹٸ  ȭ󿡼   Ѵ.    ǻ
ͷκ û ϵ ȯ漳 ɰ̸, Ʈ 1080 ϱ 
, Ʈ 80  ̴. ׸  û  ҷ ٽ  
̴. 

TIA TERM غ ̶ ̷    ̴. ̵ 
 α׷ ϸ   Ʈ    ִ. ģ ϳ 
 192.251.139.21 Ʈ 4024 ϸ      
ϴ TIA ¾ ϰ ִ.   ̷, ׷ backward ۾
 ۵Ѵ.  Ʈ 80 ϱ ؼ Ʈ 1080 (Ǵ ڽ 
س) ؾ Ѵ. 
   ùٸ ȯ漳 ƴٸ, Ϻϰ ϴٴ 
̴.    ׵      
. 

3. Setting This All Up
3.1 ϵ 䱸
츮  , ǻʹ 486-dx66, ޸𸮴 8ް, 500M  
Ƽ, 14400   ͳ ȸ ppp   ִ. ̰
 ⺻  ڽ̴. ⿡ ȭ  ؼ NE2000 ̼Ʈ
card ϳ ߰Ѵ. ׸ װ windows 3.1 ϴ 3 pc 
SunOS 4.1  2 sun ȴ. ̷    ̰ 
ſ Ϲ ͵̰   ÷   ģ ̱ 
.   ̾߱ϴ ͵ Ųÿ Ұ̶  
Mac ׸   Ƿ   . 

3.2 software setting 
  14.4 ppp   Ʈũ ӵ  ڽ  Ǿ. 
׸  ٸ ǻ͵  ̼Ʈ Ʈ . 켱 
 ɼ ְ  Ŀ ٽ ؾ Ѵ. ⼭  
Kernel- Ͽ, Ethernet-Ͽ, NET-2 Ͽ  캸, "make config" 
Ͽ. 

1. Ʈŷ SupƮ Ҵ
2. TCP/IP Ʈŷ Ҵ
3. IP Forwarding 
4. IP Firewalling Ҵ
5. IP ing Ҵ.   ϰ Ƿ ϰ δ
6. Ʈŷ Device Support Ҵ
7. 츮 PPP and ̼Ʈ support , ̰  interface 
  ̴.

׷  츮 Ŀ ٽ ϰ, ġ  Ʈ ߴ. Ʈ  
̽ Ÿ ̰, 츮  Ǿ.  
ʴ´ٸ, ٸ Ͽ ϸ   غƶ. 
 
3.3 Ʈ ּ 
̰ ſ ִ κ̴. 츮 ٸ ϱ ͳ  
Ƿ,  ּҸ  ʿ䰡 .  Ǹ C class 
192.168.2.xxx  ϴµ, ̰ ߺ test doamin  
̴. ̿Ͱ, ƹ װ  , ܺηκ  û 
浹 Ű  ̴. ׷Ƿ,  ,  ϳ  IP 
ּҰ ʿ ̴. ٸ  ϴ  ̸, Ʈ  
 ġ ʴ´. 
ppp  Ǵ ø Ʈ  IP ο϶. ȭ ̼Ʈ 
ī忡 192.168.2.1  ο϶. ׸ ȣ޴ Ʈ ٸ  ӽ
   ڵ οض. 

3.4 ׽Ʈϱ
ù°, ȭ ͳݿ ping غƶ.  ׽Ʈ  nic.ddn.mil 
ϰ ߴ. ping  Ǹ ׽Ʈ ̱ ,  ߴ
ŭ   ʾҴ. ó  ۵ ʴ´ٸ,  lan 
  ٸ ҷ õ ƶ. ׷ ۵ ʴ´ٸ, ppp  
߸ ̴. net-2 Ͽ ٽѹ а, ٽ õ ƶ. , 
ȣ޴ Ʈ  ٸ ȣƮ ping غ.  ǻ͵  
ping ؾ Ѵ. ׷ ʴٸ, net-2 Ͽ ٽа Ʈ 󿡼 
  غ. 
׷ ȣ޴ Ʈ   ǻ ȭ ping ϴ. 
 ʴٸ, ǵ Ͷ. ppp ּҰ ƴ϶ 192.168.2.1 ping ؾ 
Ѵٴ  ϶. 
׸, ȣ޴ Ʈ ηκ ȭ ppp ּҷ ping õ
 . װ ȴٸ, IP forwarding   ̸, Ŀ ٽ 
ؾ߸ Ѵ. ȣ޴ Ʈ 192.168.2.1 ̶  οϴ  
 Ŷ̶  Ʈ õ ʰ Ѵٴ  ǹѴ. ׷
 IP forwarding   ·  ϴ. ̰ Ʈ ppp 
ȸ簡 ƴ  տ ܳ´. 
, ȭκ ȣ޴ Ʈ  ӽſ ping غ
. ̶  ƹ   Ѵ.  ȭ ⺻  
. 

3.5 ȭ ȣ
ȭ ݿ   Ǿ ִٸ ƹ ȿ . 켱 
/etc/inetd.conf 캸.   "super " Ҹ װ̴. װ
 û   ѹ   Ѵ. 
:
 + Telnet
 + Talk
 + FTP
 + Daytime

ʿġ    ƶ. Ư netstat, systat, tftp, bootp, finger  
Ȯ  ض.  telnet  rlogin Ǵ  ݴ븸 Ҽ 
ִ. ׷, kill -HUP <pid> ԷϿ ش μ SIG-HUP ޽
 . ̰ inetd Ͽ config  ٽа  ϰ  
̴. ȭ Ʈ 15 ڳϿ װ ׽Ʈض. Ʈ 15 
netstat Ʈ̴. netstat  ִٸ,     ̴. 

4. Firewalling Software
4.1 밡 Ű
 ȭ  Ŀΰ ⺻ Ʈŷ Ű(inetd, telnetd
telnet, ftpd ftp)    Ʈ ʿ ʴ´.
׷, ̷ ȭ ſ ̸, ״  ʴ. 
׷, Ʈ Ű ȭ  ϰ ϵ  Ѵ. 
   غ   "socks" Ҹ ȭ Ű̴. 
̰Ϳܿ   Ѹ α׷ 2 ִ.  װ͵鿡 
  캸 ϰڴ. 

4.2 The TIS Firewall Ŷ
TIS ȭ ϰ 鵵   α׷  Ҵ. 
 α׷ ⺻ socks Ű  ,  ٸ 
  Ǿ. socks  ͳ ó ϴ ϳ
 α׷  ִ ݸ鿡, TIS ϳ α׷ ȭ 
ϴ  ƿƼ  Ҵ. 
 ΰ   ϱ www telnet ٸ  . 
socks , ϳ config ϰ ϳ  Ѵ.  ϰ 
 , telnet www ΰ  ϴ.  Ұϵ 
  ٸ 񽺵鵵 ̴. 

TIS Ŷ ,   Ӹƴ϶  www telnet Ͽ 
ϳ  ش. ̰ ģ ,  set up    
ٸ ͳ ٴ ȴ. (talk )   ʾҴٸ, 
"plug-in"  Ҽ , ٸ tooló   ϱ 
 ʴ. 

̰  ޶ , ſ Ŀٶ ̰ ȴ. socks  
ϰ   ִ. ϰ  socks ,   
 ǵ    ͳ ٸ   ֵ . TIS Ŷ
 ϸ,   ý ڰ  ٸ   ִ. 
socks ϱ , ϱ ,  ϴ. ȣ޴ Ʈ 
  ϰ ʹٸ, TIS  ϴ. ΰ  ܺη 
ʹ  ȣ Ѵ. 

4.3 TCP Wrapper 
tcp wrapper ȭ ƿƼ ƴ,   ȿ ش. 
tcp wrapper ϸ log Ҽ Ӹ ƴ϶,   ӽŰ 
񽺿 ٸ   ΰ Ҽ ִ.  ⺻  ߰
 ش. 
tcp wrapper   ̰  ̻ ϰ ٷ ʴ
. 
 tcp wrapper  ȭ ƴϴ. 
 װ Ϸ ͳݿ Ǿ ־ ϸ, ó IP ּҸ 
߸ Ѵ. 
  ڽ ġǾִ ӽŸ ϸ, Ʈ ȿ 
 . ȭ  Űó ӽ ȣ  , TCP wrapper 
 Ųÿ MS  ۵ ʴ´. 
 4.4. Ipfw and Ipfw Admin

5.  
5.1   
  ΰ software ʿ Ѵ. װ͵  ּҿ 
  ִ:
ftp://sunsite.unc.edu/pub/linux/system/network/misc/socks-linux-src.tgz 
 丮 "socks-conf" Ҹ  config ϵ ִ.   
 ӽ 丮  Ǯ, makeϴ   ø . 
 װ make    ־. Makefile ùٸ Ȯ
.   ٸ,   ׷ ʴ.
  /etc/inetd.conf ߰Ǿ Ѵٴ ߿  . 
   ߰ؾѴ:
 socks stream tcp nowait nobody /usr/local/etc/sockd sockd
 
5.2   ȯ漳
socks α׷ 2 и   ʿϴ. ϳ ٰ 
Ǿ ˸ Ѱ̸, ٸ  û     
routingϱ  ̴.     ־ Ѵ. routing 
  н ӽſ ־ Ѵ.  Ųô , ڽ 
routing  ̴. 

5.2.1 the   
socks 4.2 beta   "sockd.conf" Ҹ. װ permit deny 
   ؾ Ѵ.     Ʈ  ̴:
 + The Identifier (permit/deny)
 + The IP ּ
 + The ּ modifier

IP ּҴ  dot ǥ ̷ 4Ʈ ּҸ Ѵ. 
, 192.168.2.0  ̴. 
ּ modifier  4Ʈ  IP ̴ּ. װ ġ 
netmaskó Ѵ.  ڰ 32bit ǵ غ(1s Ǵ 0s).  
bit 1̸, װ üũϴ  bit IP ּso  bit ¾ƾ 
Ѵ. 

 , line ̷ٸ:
 permit 192.168.2.23 255.255.255.255
װ  192.168.2.3  192.168.2.23  bit ´ IP 
ּҸ  ̴.  line :
 permit 192.168.2.0 255.255.255.0
192.168.2.255  ׷ 192.168.2.0  ȣ  ̴.  
   ȵȴ:
 permit 192.168.2.0 0.0.0.0
ֳϸ ̰ ƹ ּҳ   ̱ ̴.

׷Ƿ, 켱 ϴ  ּҸ ϰ, ׷   ϶. 
domain 192.168.2.xxx   ϰ ʹٸ:
 permit 192.168.2.0 255.255.255.0
 deny 0.0.0.0 0.0.0.0
̷ ϸ  ȴ. deny line ù ° "0.0.0.0"  ָض. "0.0.0.0" 
modifier , IP ּҴ  ʴ´. Էϱ Ƿ  '0'
 ġ  ǥ̴. 
 ϳ̻ Ʈ ȴ. Ư ڸ  㰡 Ǵ  
Ҽ ִ. ̰ ident  ؼ ̷.  ý 
idnet ϴ  ƴϹǷ, Ʈ  Ͽ, װ ⼭ 
 ̾߱  ʰڴ. socks ִ     ڼ 
ִ. 

5.2.2 The Routing 
routing  гڰԵ "socks.conf" Ҹ.  " ڴ" 
̾߱   ̰   ̸ ſ Ͽ    ȥ
  ̴. 
routing  socks Ŭ̾Ʈ  socks Ұ,    
  ˷ֱ Ѵ. , 츮 Ʈ , 
192.168.2.3 ȭ 192.168.2.1 ϱ socks  ʿ 
. װ ̼Ʈ     ֱ ̴. װ
 127.0.0.1 loopback ڵ Ѵ.  ڽſ ̾߱ϱ ؼ
 socks  ʿ. ⿡ 3 Ʈ ִ. 
 + deny
 + direct
 + sockd

deny socks  û ź ˷ش.  Ʈ  sockd.conf
  indentifier, ּ, modifier  field  Ѵ. 
Ϲ, ̰͵鵵 sockd.conf,  Ͽ  ٷǷ, modifier field 
 0.0.0.0 ȴ.    ȣ⵵ Ұϰ ϰʹ
, װ ⼭   ִ. direct Ʈ  ּҰ socks  
 ΰ ˷ش. ̰͵       
ּҵ̴. ̰͵ identifier, ּ, modifier  field  Ѵ. 츮 
  ̷.
 direct 192.168.2.0 255.255.255.0

 Thus going direct for any on our ȣ޴ Ʈ.
sockd Ʈ ǻͿ  socks    ִ 
ش.   ̷:
 sockd @=<list> <IP ּ> <modifier>
 @= Ʈ ָض. ̰    list ּҸ ϵ
 ش. ׷ 
   , ġ  δ ְų  Ƶ   
. 
IP ּҿ modifier field ٸ   ۵Ѵ. ̰ 
 ּҰ  ҷ  ش. 

5.2.3 ȭ ھ DNS
ȭ ڿ  Ӽ ϴ   
. ܼ ȭ ӽſ dns  ָ ȴ. ׸ ȭ 
  ӽ  dns ϵ Ѵ.
5.3 Working With a Proxy Server

5.3.1 Unix
 ø̼   ϰ ϱؼ, װ͵ 
"sockified" ʿ䰡 ִ.   ϱ ,  
   , δٸ   telnet ʿ ̴. 
socks   α׷ sockify ϴ  ð ´. 
  ؼ sockify  Ѵٸ, socks ڵ direct 
version ȯ  ̴.  , 츮 ȣ޴ Ʈ   
α׷ ̸ ٲپְ sokify α׷ üϱ Ѵ. "finger"
 finger.orig" ǰ, "telnet" "telnet.orig"  ̴. 

 ̵  include/socks.h  Ѵٴ  ˷Ѵ.  
α׷ routing sockifying ü ٷ⵵ Ѵ. ݽ ׷ α׷
 ϳ̴.   socks field ִ  ּҸ Է
ν, ݽ 󿡼    ִ.   α׷ 
װ    ٷĿ , ּ ణ  
ϴ. 
5.3.2 MS Windows with Trumpet Winsock
trumpet winsock   ɷ ä ´. setup ޴ 
 IP ּҿ     ǻ ּҸ Է϶. 
׷, trumpet winsock  dutgoing Ŷ ٷ ̴. 

5.4 UDP Ŷ Բ ۾ϴ   
socks Ű  TCP Ŷ ϸ, UDPʹ  ʴ´. 
 socks Կ ణ  . talk archie    
α׷ UDP ̿Ѵ. Tom Fitzgerald <fitz@wang.com>  
 UDPrelay UDP Ŷ    Ǳ  
Ű ִ. ӰԵ,     װ  ȣȯ 
 ʾҴ. 

5.5   
  ٵ   ġ̴. ѵ IP ּҸ  
ͳ ٸ Ű  ø Ϸ    
̴.   ȣ޴ Ʈ ο ٱ   
ٸ  , ܺ κ  δ Ϻϰ ѳ 
̴. ̰ talk archie Ӱ   ,  ǻͷ
     Ұ ǹѴ. ̷  ۾ƺ 𸣳, 
 غ:

 ȭ ȣ Ʈ ۼϴ Ʈ ܳҴ.  
  , װ(ȭ) Ѿ ʹٰ Ѵ. ׷   . 
 ǻͰ ȭ ʿ ִٴ     . 켱 
  ȭ α Ϸ ,     
 ٸ  Ƿ, ƹ      ʾ 
 ̴. 

  ģ ٸ п ٴѴ.
 ׳࿡ ڿ  ʹ.   ϰ ̾߱Ⱑ , 
   ӽ  ⸦ Ѵ.  systems 
 administrator  ϰ , ̰   ̴. 

 UDP Ŷ Ҽ      ū ̴.  
 UDP Ǹ Ѵ. 

FTP   ٸ  Ų. ls   , ftp  
client ӽ   װ   .   ̰ 
 Ƿ, ftp ϰ  ʴ´. 
    Ѵ.   , ̰  밳
 ٸ  ξ  ̴. 

⺻, IP ּҸ  ְ ȿ   ʴ´ٸ, ȭ
/Ǵ     ƶ. IP ּҸ ʰ, ȿ  
 , term̳ slirp, TIA  Ͽ 縦 ϰ 
. term ftp://sunsite.unc.edu, slirp ftp://blitzen.canberra.edu.au/pub/slirp , 
TIA marketplace.com    ִ.  Ű  ,  
  ϸ, ͳκ  Ʈ   
 Ѵ.      ͳݿ ϱ ϴ  
host ,   setup     ʿ䰡  Ʈ 
. 

6. Ȯ 

   캸   ִ. ݱ  
  Ƹ 밳  ų ̴. ׷,   ޵ 
 ñ Ȯ   ִ Ȯ   ̶
 Ѵ. ݲ ٷͿ ñ ִٰų, ȭ  
 versatility  ִٸ,  б ٶ. 

6.1   Ŵ Ʈ
,  Milwaukee 23rd Discordian Cabal ڶ .  
ڽ site Ʈ ϱ ٶ. ſԴ 50 ǻͿ 32 IP 
 ϳ ִ.  پ level  ٸ .  level  
disciple ٸ͵ ˷ش. 
Ȯ, Ʈ Ưκ  level ƴ disciple  ȣϰ  
̴. 

disclaimer:  Discordians  ƴϴ.  ׵  𸣸, 
  ʴ´.  ׵  ν ̿ ̴. Please 
send all flames to
The levels are:
 1. The external level. This is the level that gets shown to
 everybody. Basically, this is the ranting and raving about Eris,
 Goddess of Discord, and all the rest of the drivel.
 2. Sage This is the level of people who have gotten beyond the
 external level. Here is where you tell them that discord and
 structure are really one, and that Eris is also Jehovah.
 3. Adept Here is where the real plan is. In this level is stored all
 the information on how the Discordian Society is going to take over
 the world through a devious, yet humorous, plan involving Newt
 Gingrich, Wheaties Cereal, O.J. Simpson, and five hundred crystals,
 all erroneously marked "6.5 MHz".

6.1.1 The Ʈ Setup
IP ѹ ̷ ĵǾ ִ:
 ù ° ѹ 192.168.2.255ε, ̰ broadcast number̸ Ұ
 ϴ. 
 32 IP ּ 23 ߳ ٰ  23 ӽſ Ҵ
 Ǿִ. 
 1 extra IP Ʈ   ڽ . 
 1 extra Ʈ  Ǵٸ  ڽ . 
 4 paul, ringo, john, george  ̸ ־ ä ִ. 
  Ȧ  ̴. 
 ȣ޴ Ʈ 192.168.2.xxx ּҵ  ִ. 

׸ ,   и Ʈ ,  ٸ ִ. 
׵ Infrared ̼Ʈ Ͽ routing ǹǷ,   ۿ 
.  Ե, infrared ̼Ʈ Ϲ ̼Ʈó ۵ϹǷ, 츮 ׵
 Ϲ ̼Ʈó ص ȴ. 
 Ʈ extra IP  ϳ  ڽ Ǿִ. 
׸  ȣ޴ Ʈ ϴ   ִ. ̰  ÷
   higher sage ϰ ֱ ̴.   sage Ʈ
  192.168.2.17, adept Ʈ  192.168.2.23  ִ. װ 
 ٸ ̼Ʈ card  ϹǷ,  ٸ IP ּҸ  ־
 Ѵ. װͿ forwarding IP бȴ. 

   ڽ ִ IP forwarding  off Ǿ Ѵ. router  
  ʴ 192.168.2.xxx ϴ Ŷ forwarding  ̴. 
׷Ƿ, ͳݿ     . ⿡ IP forwarding off 
س  sage Ʈκ Ŷ adept Ʈ vica versa 
ϱ ϰ  ̴. nfs  δٸ Ʈ ٸ  
   ִ. ̰ ſ ϰ Ǹ, ɺ ũ ϴ 
ణ Ӽ Ϲ  ο   ִ. Ǵٸ ̼Ʈ 
card  setup ϸ    ϳ ٸ   Ʈ 
  ִ. 

6.1.2 The Proxy Setup
devious     ΰ Ʈ ͸ ϱ Ѵٸ,  
 ΰ net ٸ  ʿ䰡 ִ. ܺ Ʈ ͳݿ  
Ǿ Ƿ, ⿡ procy  ġ  . adept sage 
Ʈ ȭ ʿ Ƿ, ⿡    ʿ
.   Ʈ ſ ϰ   ̴.   Ʈ 
 IP ּҰ ο ̴.     հ ϱ   
 parameter ߰ ̴. 

1.  ͳ       . ̰  
  ̷ Ÿ  ͵鿡  Ű, 
 װ ߿ϴٸ,   ʾƾ Ѵ.

2. 츮 sage www ٸ   ̴. ׵ Ʈ̴̸, 
 ̷ ˻ ذ  ִ. 
׷Ƿ sage  ڽsockd.conf    ؾ Ѵ:
 deny 192.168.2.17 255.255.255.255
׸ adept ӽ:
 deny 192.168.2.23 255.255.255.255
 sage  ڽ   Ѵ:
 deny 0.0.0.0 0.0.0.0 eq 80

̰ http Ʈ Ʈ 80 Ʈ Ϸ  ӽ ٸ 
Ѵ. ׷ ٸ seervice  Ǹ,  ٸ źεǴ 
̴. 
̹ źΰ  ͵ ϰ(. sage Ʈκ    
ϴ .), 192.168.2.xxx  ǻͰ    ϵ 
Ϸ    Ѵ:

sage sockd.conf    Ÿ ̴:
 deny 192.168.2.17 255.255.255.255
 deny 0.0.0.0 0.0.0.0 eq 80
 permit 192.168.2.0 255.255.255.0
׸ adept   :
 deny 192.168.2.23 255.255.255.255
 permit 192.168.2.0 255.255.255.0
̰   ùٸ  ̴.   Ʈ  
ȣ ϸ,  Ǿ  ̴.    ̴.  
 6.5 MHz ũŻ . 