Eu tenho um gateway (+ firewall + proxy) configurado em uma caixa Squeeze com 2 NICs. O problema é que o cliente não pode ver alguns dos HTTPS (por exemplo, eles podem usar o link , mas não o link Mas quando eu tento com curl ou wget no servidor não tem problemas.
Este é o meu resultado "route -n"
Destination Gateway Genmask Flags Metric Ref Use Iface
vpn.server.ip.addr 0.0.0.0 255.255.255.255 UH 0 0 0 eth0
virtual.vpn.ip.addr 0.0.0.0 255.255.255.255 UH 0 0 0 ppp0
192.168.250.0 0.0.0.0 255.255.255.252 U 0 0 0 eth0
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
0.0.0.0 0.0.0.0 0.0.0.0 U 0 0 0 ppp0
este é o meu firewall
SQUID_SERVER="192.168.1.14"
# Interface connected to Internet
INTERNET="ppp0"
# Interface connected to LAN
LAN_IN="eth1"
# Squid port
SQUID_PORT="3128"
SIP1="5060"
SIP2="5061"
# DO NOT MODIFY BELOW
# Clean old firewall
iptables -F
iptables -X
iptables -t nat -F
iptables -t nat -X
iptables -t mangle -F
iptables -t mangle -X
# Load IPTABLES modules for NAT and IP conntrack support
modprobe ip_conntrack
modprobe ip_conntrack_ftp
echo 1 > /proc/sys/net/ipv4/ip_forward
# Setting default filter policy
iptables -P INPUT ACCEPT
iptables -P OUTPUT ACCEPT
# Unlimited access to loop back
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT
# Allow UDP, DNS and Passive FTP
iptables -A INPUT -i $INTERNET -m state --state ESTABLISHED,RELATED -j ACCEPT
# DNAT port 80 request comming from LAN systems to squid 3128 ($SQUID_PORT) aka transparent proxy
iptables -t nat -A PREROUTING -i $LAN_IN -p tcp --dport 80 -j DNAT --to $SQUID_SERVER:$SQUID_PORT
# if it is same system
#iptables -t nat -A PREROUTING -i $LAN_IN -p tcp --dport 80 -j REDIRECT --to-port $SQUID_PORT
# set this system as a router for Rest of LAN
iptables -t nat -A POSTROUTING -o $INTERNET -j MASQUERADE
iptables -A FORWARD -i $LAN_IN -j ACCEPT
# unlimited access to LAN
iptables -A INPUT -i $LAN_IN -j ACCEPT
iptables -A OUTPUT -o $LAN_IN -j ACCEPT
iptables -A INPUT -p tcp --dport 22 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j ACCEPT
iptables -A INPUT -p tcp --dport 10000 -j ACCEPT
iptables -A INPUT -p udp --dport $SIP1 -j ACCEPT
iptables -A INPUT -p udp --dport $SIP2 -j ACCEPT
iptables -A INPUT -p tcp --dport $SIP1 -j ACCEPT
iptables -A INPUT -p tcp --dport $SIP2 -j ACCEPT
e este é meu squid.conf
http_port 3128 transparent
acl QUERY urlpath_regex cgi-bin \?
no_cache deny QUERY
acl NO-CACHE-SITES dstdomain "/root/not-to-cache-sites.txt"
no_cache deny NO-CACHE-SITES
cache_mem 50 MB
cache_dir ufs /var/spool/squid 50000 16 256
cache_access_log /var/log/squid/access.log
cache_log /var/log/squid/cache.log
cache_store_log /var/log/squid/store.log
pid_filename /var/run/squid.pid
dns_nameservers 208.67.222.222 208.67.220.220 8.8.8.8 8.8.4.4
refresh_pattern ^ftp: 1440 20% 10080
refresh_pattern ^gopher: 1440 0% 1440
refresh_pattern . 0 20% 4320
acl all src 0.0.0.0/0.0.0.0
acl localhost src 127.0.0.1/255.255.255.255
acl manager proto cache_object
acl serveur src 192.168.1.14
acl multipostes src 192.168.1.1-192.168.1.254
#acl SSL_ports port 443 563
acl Safe_ports port 80 # http
acl Safe_ports port 20 # ftp-data
acl Safe_ports port 21 # ftp
acl Safe_ports port 443 563 # ssl
acl Safe_ports port 70 # gopher
acl Safe_ports port 210 # wais
acl Safe_ports port 1025-65535 # unregistered ports
acl Safe_ports port 280 # http-mgmt
acl Safe_ports port 488 # gss-http
acl Safe_ports port 591 # filemaker
acl Safe_ports port 777 # multiling http
acl Safe_ports port 631 # cups
acl Safe_ports port 873 # rsync
acl Safe_ports port 901 # SWAT
acl purge method PURGE
acl CONNECT method CONNECT
acl SSL method CONNECT
acl SSL_ports port 10000 # webmin
acl Safe_ports port 10000 # webmin
acl Safe_ports port 137 138 139 445
acl Safe_ports port 500
acl Safe_ports port 47
acl Safe_ports port 4569
acl Safe_ports port 995 # pop3 of gmail
acl Safe_ports port 587 # smtp of gmail
acl Safe_ports port 465 # smtp of gmail
acl Safe_ports port 993 # smtp of gmail
acl Safe_ports port 25 # smtp
acl Safe_ports port 110 # pop3
acl Safe_ports port 143 # pop3
http_access allow manager all
http_access deny manager
http_access allow purge localhost
http_access deny purge
http_access deny CONNECT !SSL_ports
http_access allow localhost
http_access allow all
http_reply_access allow all
icp_access allow all
cache_effective_user proxy
cache_effective_group proxy
visible_hostname serveur
always_direct allow all
Nota : eu verifiquei com o Wireshark e não há erros. Eu também tentei com conexão direta sem VPN, e funciona bem.