On 23/10/2012 10:21 p.m., alberto.desi wrote:
Hello guys,
I'm becoming crazy!
I am a student and I am working with Squid for a project about content
delivery networks.
Setting up the system (all in IPv6) I have found out some issues.
To set up it I followed http://wiki.squid-cache.org/Features/Tproxy4 because
I need a trasparent proxy and for IPv6 this the way. The problem is that
passing through I have to start a rewrite_url_program, written in perl. All
is working, I pass, the perl file is started and so on. But I have to
rewrite the url or to a machine called origin or to the local machine, where
I have installed Squid. If I rewrite the url to go to the origin, is ok.
When I rewrite the link to go to the local cache it seems like blocked. I am
using this iptables rules:
Sounds familiar. Did you get my response to your earlier request ~10
days ago?
Some questions:
* a machine *called* "origin" or an "origin server" ?
* a machine called "localhost" or the "local machine" ?
The difference in these things is rather important.
A copy of the perl re-writer would be helpful in identifying what it does.
Also, a copy of the cache.log output when squid is run with
"debug_options 11,2". The line containing "HTTP Server REQUEST", the one
above it, and the headers below which are generated when sending your
re-written request would also be very useful.
Amos
ip6tables -t mangle -N DIVERT
ip6tables -t mangle -A DIVERT -j MARK --set-mark 1
ip6tables -t mangle -A DIVERT -j ACCEPT
ip6tables -t mangle -A PREROUTING -p tcp -m socket -j DIVERT
ip6tables -t mangle -A PREROUTING -p tcp --dport 80 -j TPROXY --tproxy-mark
0x1/0x1 --on-port 3129
and I set up also
ip -f inet6 rule add fwmark 1 lookup 100
ip -f inet6 route add local default dev eth0 table 100 <= changed dev with
arriving interface (for me eth2)
It seems that the packets redirected to the cache of the machine with squid
are in an internal loop.
Can you help me to understand why, and maybe how to find a solution?
This mechanism was working with the IPv4 rules for the trasparent proxy
(with nat chain), but here with IPv6 the things are different!!!
Thanks a lot
P.S.
all the machines are running
- Linux Ubuntu, kernel 2.6.39
- iptables v. 1.4.16.2
- Squid 3.2.2
*[squid.conf]* file
#
# 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 localnet src 3001::/64
acl localnet src 5001::/64
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
#
# Recommended minimum Access Permission configuration:
#
# Only allow cachemgr access from localhost
http_access allow localhost manager
http_access deny manager
# 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
# 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
#
# 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
http_access allow all
# And finally deny all other access to this proxy
#http_access deny all
# Squid normally listens to port 3128
http_port 3128
http_port 3129 tproxy
# Uncomment and adjust the following to add a disk cache directory.
#cache_dir ufs /usr/local/squid/var/cache/squid 100 16 256
# Leave coredumps in the first cache dir
coredump_dir /usr/local/squid/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
visible_hostname machine1
url_rewrite_program /home/alberto/rewriteurl.pl
