Hi,
For over two weeks i am having a really headache in configuring squid transparent/intercept.
I have tried different options and configurations but i couldn't get it to work.
i think the problems lies in the Iptables / NAT but i really couldn't solve it.
I have tried different iptable rules including the intercept linuxDnat - sysctl configuration, but didnt work.
# your proxy IP
SQUIDIP=X.X.X.X
# your proxy listening port
SQUIDPORT=XXXX
iptables -t nat -A PREROUTING -s $SQUIDIP -p tcp --dport 80 -j ACCEPT
iptables -t nat -A PREROUTING -p tcp --dport 80 -j DNAT --to-destination $SQUIDIP:$SQUIDPORT
iptables -t nat -A POSTROUTING -j MASQUERADE
iptables -t mangle -A PREROUTING -p tcp --dport $SQUIDPORT -j DROP
i have to say that squid works well when i configure in the client browsers.
at the mikrotik side, i am using DST-NAT chain port 80 pro TCP action DST-NAT to address squidIP and Port
i am using ubuntu server 15.04 using squid 3.3.8 and this is my configuration and the errors i get:
------ eth0 WAN <----- MAIN WAN Public IP Internet
MK---|
------ eth1 LAN
|
------ eth2 Proxy
------ eth0 WAN ---> Public IP --> Internet --> gets internet from 24online / another Mikrotik
Squid---|
------ eth1 Proxy
|
------ eth2 webmin --> For server Management
-error1: if no intercept/transparent and no iptables is configured
-Invalid URL - The requested url could not be retrieved
-but if proxy is configured in the user browser - it works!
-error2:if intercept and iptable DNAT is configured
-Access Denied and in the access log TCP-MISS/403
-no forward proxy port configured
-security alert : host header forgery detected on local= SquidIP:8080 remote:mikrotikIP (local ip does not match any domain name)
-warning : forwarding loop detected (x-Forwarded-for mikrotik lan IP)
squid.conf
acl localnet src 10.0.0.0/8 # RFC1918 possible internal network
acl localnet src 192.168.0.0/16 # RFC1918 possible internal network
acl SSL_ports port 443
acl Safe_ports port 80 # http
acl Safe_ports port 21 # ftp
acl Safe_ports port 443 # https
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 CONNECT method CONNECT
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports
http_access allow localhost manager
http_access deny manager
http_access allow localnet
http_access allow localhost
http_access deny all
http_port 8080
http_port 8181
cache_mem 2000 MB
cache_dir ufs /var/spool/squid3 100000 16 256
coredump_dir /var/spool/squid3
refresh_pattern ^ftp: 1440 20% 10080
refresh_pattern ^gopher: 1440 0% 1440
refresh_pattern -i (/cgi-bin/|\?) 0 0% 0
refresh_pattern (Release|Packages(.gz)*)$ 0 20% 2880
refresh_pattern . 0 20% 4320
cache_effective_user proxy
cache_effective_group proxy
----------------------------------------
I am really confused, can anyone guide me please.
Thanks in advance
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