I'm trying to setup a transparent proxy on my local machine. This works when I give Firefox proxy info, but this fails when I get iptables to redirect with (the rule I keep turning on/off): iptables -t nat -A OUTPUT -p tcp --dport 80 -j REDIRECT --to-port 3128 And the rest of the nat table is just: *nat -A OUTPUT -m owner --uid-owner 31 -j ACCEPT COMMIT When this is enabled, I just get: ERROR The requested URL could not be retrieved and "Invalid URL" Which is a squid message and I'm seeing the requests in the access log but I'm guessing something needs to be rewritten that isn't or squid is doing too much. swlap1 ~ # squid -v Squid Cache: Version 3.3.8 configure options: '--prefix=/usr' '--build=x86_64-pc-linux-gnu' '--host=x86_64-pc-linux-gnu' '--mandir=/usr/share/man' '--infodir=/usr/share/info' '--datadir=/usr/share' '--sysconfdir=/etc' '--localstatedir=/var/lib' '--libdir=/usr/lib64' '--disable-dependency-tracking' '--sysconfdir=/etc/squid' '--libexecdir=/usr/libexec/squid' '--localstatedir=/var' '--with-pidfile=/run/squid.pid' '--datadir=/usr/share/squid' '--with-logdir=/var/log/squid' '--with-default-user=squid' '--enable-removal-policies=lru,heap' '--enable-storeio=aufs,diskd,rock,ufs' '--enable-disk-io' '--enable-auth' '--enable-auth-basic=MSNT,MSNT-multi-domain,NCSA,POP3,getpwnam,PAM' '--enable-auth-digest=file' '--enable-auth-ntlm=none' '--enable-auth-negotiate=none' '--enable-external-acl-helpers=file_userip,session,unix_group' '--enable-log-daemon-helpers' '--enable-url-rewrite-helpers' '--enable-cache-digests' '--enable-delay-pools' '--enable-eui' '--enable-icmp' '--enable-follow-x-forwarded-for' '--enable-esi' '--with-large-files' '--disable-strict-error-checking' '--without-libcap' '--enable-ipv6' '--disable-snmp' '--enable-ssl' '--disable-ssl-crtd' '--disable-icap-client' '--disable-ecap' '--enable-linux-netfilter' 'build_alias=x86_64-pc-linux-gnu' 'host_alias=x86_64-pc-linux-gnu' 'CC=x86_64-pc-linux-gnu-gcc' 'CFLAGS=-march=native -freorder-blocks-and-partition -O2 -pipe' 'LDFLAGS=-Wl,-O1 -Wl,--as-needed' 'CXXFLAGS=-march=native -freorder-blocks-and-partition -O2 -pipe' 'PKG_CONFIG_PATH=/usr/lib64/pkgconfig' /etc/squid/squid.conf: # # Recommended minimum configuration: # # Example rule allowing access from your local networks. # Adapt to list your (internal) IP networks from where browsing # should be allowed acl localnet src 10.0.0.0/8 # RFC1918 possible internal network acl localnet src 172.16.0.0/12 # RFC1918 possible internal network acl localnet src 192.168.0.0/16 # RFC1918 possible internal network acl localnet src fc00::/7 # RFC 4193 local private network range acl localnet src fe80::/10 # RFC 4291 link-local (directly plugged) machines 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 Safe_ports port 901 # SWAT acl CONNECT method CONNECT # # Recommended minimum Access Permission configuration: # # Deny requests to certain unsafe ports http_access deny !Safe_ports # Deny CONNECT to other than secure SSL ports http_access deny CONNECT !SSL_ports # Only allow cachemgr access from localhost http_access allow localhost manager http_access deny manager # We strongly recommend the following be uncommented to protect innocent # web applications running on the proxy server who think the only # one who can access services on "localhost" is a local user #http_access deny to_localhost # # INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS # acl localhost src 127.0.0.1/32 ::1 acl to_localhost dst 127.0.0.0/8 0.0.0.0/32 ::1 # Example rule allowing access from your local networks. # Adapt localnet in the ACL section to list your (internal) IP networks # from where browsing should be allowed http_access allow localnet http_access allow localhost # And finally deny all other access to this proxy http_access deny all # Squid normally listens to port 3128 http_port 3128 transparent # Uncomment and adjust the following to add a disk cache directory. #cache_dir ufs /var/cache/squid 100 16 256 # Leave coredumps in the first cache dir coredump_dir /var/cache/squid # # Add any of your own refresh_pattern entries above these. # refresh_pattern ^ftp: 1440 20% 10080 refresh_pattern ^gopher: 1440 0% 1440 refresh_pattern -i (/cgi-bin/|\?) 0 0% 0 refresh_pattern . 0 20% 4320
