[슛돌]님이 남기신 글:

>-----------------------------------------
>답변자가 기본적으로 참고할 내용입니다.
>- 배포판(옵션)    : 페도라코어4
>- 커널버전(옵션)
  : 2.6.14-1.1644_FC4
>- 데몬버전(예:apache
 1.3.27) : bind-9.3.1-14_FC4
>- 데몬설치유형(RPM/컴파일/기타)
 : RPM
>-----------------------------------------
>
>안녕하세요.
>
>일본에 셋팅한 서버가 문제가 생겨 문의드립니다.
>일단 증상을 말씀 드리자면...
>
>www.abc.com
>www.abc.co.jp
>
>이런 도메인이 두개가 있습니다. bind 설정을 하고..
>nslookup 또는 dig 를 사용해서 질의를 해보면..
>(dig @168.126.63.1 www.abc.co.jp)
>
>원하는 ip를 가지고 옵니다. 
>로컬,외부 모두 정상적으로 ip를 가지고 옵니다.
>

답변이 늦었습니다.

dig +trace ....

이런식으로 +trace 여러번 테스트해 보세요.
아마도 2차 네임서버가 있다면 Master/Slave 동기화 문제인것도
같네요.

>그런데 위 도메인으로 웹페이지 접속시 문제가
발생합니다.
>PC에 따라서 웹페이지를 정상적으로 표시하는 PC가
있는반면...
>페이지를 찾을수 없다고 나오는 PC가 있습니다.
>
>물론 페이지를 못찾는 PC에서 nslookup등으로 도메인을
검색해보면...
>정상적으로 IP를 얻어옵니다.
>
>약간 의심되는 부분이 있는데..
>Apache는 iptable을 사용해서 포트포워딩으로
 내부에서 서비스 되고 있습니다. 포트포워딩이 됐다 안됐다
하는 문제 일수도 있다고 생각은 듭니다.
>
>iptable rule 을 올려봅니다. 아래 룰은 커널 2.4버전에서 실제로
사용하고 운영하던 내용을 가져다가 2.6버전에서 그냥
사용했습니다.
>
>너무 두서없이 질문을 드린건 아닌지 모르겠네요.
>질문에 부족한 내용있으면 알려주세요.
>
>그럼 수고하세요 :)
>
>
>#!/bin/sh
>FWVER=0.73s
>echo -e "\nLoading STRONGER rc.firewall - version $FWVER..\n"
>IPTABLES=/sbin/iptables
>LSMOD=/sbin/lsmod
>DEPMOD=/sbin/depmod
>INSMOD=/sbin/insmod
>GREP=/bin/grep
>AWK=/bin/awk
>SED=/bin/sed
>IFCONFIG=/sbin/ifconfig
>
>EXTIF0="ppp0"
>
>INTIF0="eth1"
>INTIF1="eth2"
>INTIF2="eth0"
>echo "  External Interface:  $EXTIF0"
>echo "  External Interface:  $INTIF0"
>echo "  Internal Interface:  $INTIF1"
>echo "  DMZ      Interface:  $INTIF2"
>echo "  ---"
>
>EXTIP0="`$IFCONFIG $EXTIF0 | $GREP 'inet addr' | $AWK '{print $2}' |
\
>$SED -e 's/.*://'`"
>
>echo "  External IP: $EXTIP0"
>echo "  ---"
>
>INTNET0="192.168.1.0/24"
>INTIP0="192.168.1.1/24"
>echo "  Internal Network: $INTNET0"
>echo "  Internal IP:      $INTIP0"
>echo "  ---"
>INTNET1="192.168.2.0/24"
>INTIP1="192.168.2.1/24"
>echo "  Internal Network: $INTNET1"
>echo "  Internal IP:      $INTIP1"
>echo "  ---"
>INTNET2="192.168.0.0/24"
>INTIP2="192.168.0.1/24"
>echo "  DMZ      Network: $INTNET2"
>echo "  DMZ      IP:      $INTIP2"
>echo "  ---"
>
>UNIVERSE="0.0.0.0/0"
>
>echo "  - Verifying that all kernel modules are ok"
>$DEPMOD -a
>
>echo -en "    Loading kernel modules: "
>
>echo -en "ip_tables, "
>if [ -z "` $LSMOD | $GREP ip_tables | $AWK {'print $1'} `" ];
then
>   $INSMOD ip_tables
>fi
>
>echo -en "ip_conntrack, "
>if [ -z "` $LSMOD | $GREP ip_conntrack | $AWK {'print $1'} `" ];
then
>   $INSMOD ip_conntrack
>fi
>
>echo -e "ip_conntrack_ftp, "
>if [ -z "` $LSMOD | $GREP ip_conntrack_ftp | $AWK {'print $1'} `" ];
then
>   $INSMOD ip_conntrack_ftp
>fi
>
>echo -en "                             ip_conntrack_irc, "
>if [ -z "` $LSMOD | $GREP ip_conntrack_irc | $AWK {'print $1'} `" ];
then
>   $INSMOD ip_conntrack_irc
>fi
>
>echo -en "iptable_nat, "
>if [ -z "` $LSMOD | $GREP iptable_nat | $AWK {'print $1'} `" ];
then
>   $INSMOD iptable_nat
>fi
>
>echo -e "ip_nat_ftp"
>if [ -z "` $LSMOD | $GREP ip_nat_ftp | $AWK {'print $1'} `" ];
then
>   $INSMOD ip_nat_ftp
>fi
>
>echo "  ---"
>
>echo "  Enabling forwarding.."
>echo "1" > /proc/sys/net/ipv4/ip_forward
>
>echo "  Enabling DynamicAddr.."
>echo "1" > /proc/sys/net/ipv4/ip_dynaddr
>
>echo "  ---"
>
>echo "  Clearing any existing rules and setting default policy to
DROP.."
>$IPTABLES -P INPUT DROP
>$IPTABLES -F INPUT
>$IPTABLES -P OUTPUT DROP
>$IPTABLES -F OUTPUT
>$IPTABLES -P FORWARD DROP
>$IPTABLES -F FORWARD
>$IPTABLES -F -t nat
>
>if [ -n "`$IPTABLES -L | $GREP drop-and-log-it`" ]; then
>   $IPTABLES -F drop-and-log-it
>fi
>$IPTABLES -X
>$IPTABLES -Z
>
>echo "  Creating a DROP chain.."
>$IPTABLES -N drop-and-log-it
>$IPTABLES -A drop-and-log-it -j LOG
>$IPTABLES -A drop-and-log-it -j DROP
>
>echo -e "\n   - Loading INPUT rulesets"
>
>$IPTABLES -A INPUT -i lo -s $UNIVERSE -d $UNIVERSE -j ACCEPT
>
>$IPTABLES -A INPUT -i $INTIF0 -s $INTNET0 -d $UNIVERSE -j ACCEPT
>$IPTABLES -A INPUT -i $INTIF1 -s $INTNET1 -d $UNIVERSE -j ACCEPT
>$IPTABLES -A INPUT -i $INTIF2 -s $INTNET2 -d $UNIVERSE -j ACCEPT
>
>$IPTABLES -A INPUT -i $EXTIF0 -s $UNIVERSE -d $EXTIP0 -m state --state
ESTABLISHED,RELATED -j ACCEPT
>
>$IPTABLES -A INPUT -i $EXTIF0 -s $INTNET0 -d $UNIVERSE -j
drop-and-log-it
>$IPTABLES -A INPUT -i $EXTIF0 -s $INTNET1 -d $UNIVERSE -j
drop-and-log-it
>$IPTABLES -A INPUT -i $EXTIF0 -s $INTNET2 -d $UNIVERSE -j
drop-and-log-it
>
># NameServer
>#
>echo -e "      - Allowing EXTERNAL access to the Name server"
>$IPTABLES -A INPUT -i $EXTIF0 -m state --state NEW,ESTABLISHED,RELATED -p tcp -s
$UNIVERSE -d $EXTIP0 --dport 42 -j ACCEPT
>$IPTABLES -A INPUT -i $EXTIF0 -m state --state NEW,ESTABLISHED,RELATED -p udp -s
$UNIVERSE -d $EXTIP0 --dport 42 -j ACCEPT
>$IPTABLES -A INPUT -i $EXTIF0 -m state --state NEW,ESTABLISHED,RELATED -p tcp -s
$UNIVERSE -d $EXTIP0 --dport 53 -j ACCEPT
>$IPTABLES -A INPUT -i $EXTIF0 -m state --state NEW,ESTABLISHED,RELATED -p udp -s
$UNIVERSE -d $EXTIP0 --dport 53 -j ACCEPT
>$IPTABLES -A INPUT -s $UNIVERSE -d $UNIVERSE -j drop-and-log-it
>
>echo -e "   - Loading OUTPUT rulesets"
>
>$IPTABLES -A OUTPUT -o lo -s $UNIVERSE -d $UNIVERSE -j ACCEPT
>
>$IPTABLES -A OUTPUT -o $INTIF0 -s $EXTIP0 -d $INTNET0 -j ACCEPT
>$IPTABLES -A OUTPUT -o $INTIF0 -s $EXTIP0 -d $INTNET1 -j ACCEPT
>$IPTABLES -A OUTPUT -o $INTIF0 -s $EXTIP0 -d $INTNET2 -j ACCEPT
>$IPTABLES -A OUTPUT -o $INTIF1 -s $EXTIP0 -d $INTNET0 -j ACCEPT
>$IPTABLES -A OUTPUT -o $INTIF1 -s $EXTIP0 -d $INTNET1 -j ACCEPT
>$IPTABLES -A OUTPUT -o $INTIF1 -s $EXTIP0 -d $INTNET2 -j ACCEPT
>$IPTABLES -A OUTPUT -o $INTIF2 -s $EXTIP0 -d $INTNET0 -j ACCEPT
>$IPTABLES -A OUTPUT -o $INTIF2 -s $EXTIP0 -d $INTNET1 -j ACCEPT
>$IPTABLES -A OUTPUT -o $INTIF2 -s $EXTIP0 -d $INTNET2 -j ACCEPT
>
>$IPTABLES -A OUTPUT -o $INTIF0 -s $INTIP1 -d $INTNET0 -j ACCEPT
>$IPTABLES -A OUTPUT -o $INTIF0 -s $INTIP1 -d $INTNET1 -j ACCEPT
>$IPTABLES -A OUTPUT -o $INTIF0 -s $INTIP1 -d $INTNET2 -j ACCEPT
>$IPTABLES -A OUTPUT -o $INTIF1 -s $INTIP1 -d $INTNET0 -j ACCEPT
>$IPTABLES -A OUTPUT -o $INTIF1 -s $INTIP1 -d $INTNET1 -j ACCEPT
>$IPTABLES -A OUTPUT -o $INTIF1 -s $INTIP1 -d $INTNET2 -j ACCEPT
>$IPTABLES -A OUTPUT -o $INTIF2 -s $INTIP2 -d $INTNET0 -j ACCEPT
>$IPTABLES -A OUTPUT -o $INTIF2 -s $INTIP2 -d $INTNET1 -j ACCEPT
>$IPTABLES -A OUTPUT -o $INTIF2 -s $INTIP2 -d $INTNET2 -j ACCEPT
>
>$IPTABLES -A OUTPUT -o $EXTIF0 -s $UNIVERSE -d $INTNET0 -j
drop-and-log-it
>$IPTABLES -A OUTPUT -o $EXTIF0 -s $UNIVERSE -d $INTNET1 -j
drop-and-log-it
>$IPTABLES -A OUTPUT -o $EXTIF0 -s $UNIVERSE -d $INTNET2 -j
drop-and-log-it
>
>$IPTABLES -A OUTPUT -o $EXTIF0 -s $EXTIP0 -d $UNIVERSE -j ACCEPT
>
>$IPTABLES -A OUTPUT -s $UNIVERSE -d $UNIVERSE -j drop-and-log-it
>
>echo -e "   - Loading FORWARD rulesets"
>
>echo "     - FWD: Allow all connections OUT and only existing/related
IN"
>#PORTFWIPHTTP="192.168.0.11:80-192.168.0.12:80"
>#PORTFWIPFTP="192.168.0.11:21-192.168.0.12:21"
>PORTFWIPHTTP="192.168.0.11:80"
>PORTFWIPFTP="192.168.0.11:21"
>$IPTABLES -A PREROUTING -t nat -p tcp -d $EXTIP0 --dport 80 -j DNAT --to
$PORTFWIPHTTP
>$IPTABLES -A FORWARD -i $EXTIF0 -o $INTIF2 -p tcp --dport 80 -m state --state
NEW,ESTABLISHED,RELATED -j ACCEPT
>$IPTABLES -A PREROUTING -t nat -p tcp -d $EXTIP0 --dport 21 -j DNAT --to
$PORTFWIPFTP
>$IPTABLES -A FORWARD -i $EXTIF0 -o $INTIF2 -p tcp --dport 21 -m state --state
NEW,ESTABLISHED,RELATED -j ACCEPT
>
>$IPTABLES -A FORWARD -i $EXTIF0 -o $INTIF0 -m state --state ESTABLISHED,RELATED -j
ACCEPT
>$IPTABLES -A FORWARD -i $EXTIF0 -o $INTIF1 -m state --state ESTABLISHED,RELATED -j
ACCEPT
>$IPTABLES -A FORWARD -i $EXTIF0 -o $INTIF2 -m state --state ESTABLISHED,RELATED -j
ACCEPT
>
>$IPTABLES -A FORWARD -i $INTIF1 -o $EXTIF0 -j ACCEPT
>$IPTABLES -A FORWARD -i $INTIF2 -o $EXTIF0 -j ACCEPT
>
>$IPTABLES -A FORWARD -i $INTIF1 -o $INTIF0 -j ACCEPT
>$IPTABLES -A FORWARD -i $INTIF2 -o $INTIF0 -j ACCEPT
>$IPTABLES -A FORWARD -i $INTIF0 -o $INTIF1 -j ACCEPT
>$IPTABLES -A FORWARD -i $INTIF2 -o $INTIF1 -j ACCEPT
>$IPTABLES -A FORWARD -i $INTIF0 -o $INTIF2 -j ACCEPT
>$IPTABLES -A FORWARD -i $INTIF1 -o $INTIF2 -j ACCEPT
>
>$IPTABLES -A FORWARD -j drop-and-log-it
>
>echo -e "\nDone.\n" 

========================================