服务器详细信息
Squid Transparent Proxy Version: 3.3.8
OS: Ubuntu Server 14.04
Server IP: 192.168.1.3
Squid 配置文件
（使用 grep 排除注释）
root@ubuntu:~# grep -v '^$\|^\s*\#' /etc/squid3/squid.conf
acl SSL_ports port 443
acl Safe_ports port 80 # http
acl Safe_ports port 21 # ftp
acl Safe_ports port 443 # https
acl Safe_ports port 70 # gopher
acl Safe_ports port 210 # wais
acl Safe_ports port 1025-65535 # unregistered ports
acl Safe_ports port 280 # http-mgmt
acl Safe_ports port 488 # gss-http
acl Safe_ports port 591 # filemaker
acl Safe_ports port 777 # multiling http
acl CONNECT method CONNECT
acl mylocalnetwork src 192.168.1.0/24
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports
http_access allow localhost manager
http_access allow mylocalnetwork
http_access deny manager
http_access allow localhost
http_access deny all
http_port 3128 transparent
cache_mem 8 MB
maximum_object_size_in_memory 32 KB
memory_replacement_policy heap GDSF
cache_replacement_policy heap LFUDA
cache_dir aufs /opt/squid/cache 10000 14 256
maximum_object_size 128000 KB
cache_swap_low 95
cache_swap_high 99
coredump_dir /var/spool/squid3
refresh_pattern ^ftp: 1440 20% 10080
refresh_pattern ^gopher: 1440 0% 1440
refresh_pattern -i (/cgi-bin/|\?) 0 0% 0
refresh_pattern (Release|Packages(.gz)*)$ 0 20% 2880
refresh_pattern -i \.(gif|png|jp?g|ico|bmp|tiff?)$ 10080 95% 43200
refresh_pattern -i \.(rpm|cab|deb|exe|msi|msu|zip|tar|xz|bz|bz2|lzma|gz|tgz|rar|bin|7z|doc?|xls?|ppt?|pdf|nth|psd|sis)$ 10080 90% 43200
refresh_pattern -i \.(avi|iso|wav|mid|mp?|mpeg|mov|3gp|wm?|swf|flv|x-flv|axd)$ 43200 95% 432000
refresh_pattern -i \.(html|htm|css|js)$ 1440 75% 40320
refresh_pattern -i \.index.(html|htm)$ 0 75% 10080
refresh_pattern -i (/cgi-bin/|\?) 0 0% 0
refresh_pattern . 1440 90% 10080
quick_abort_min 0 KB
quick_abort_max 0 KB
quick_abort_pct 100
store_avg_object_size 13 KB
visible_hostname localhost
鱿鱼卷
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2014/07/03 22:11:57| ERROR: No forward-proxy ports configured.
2014/07/03 22:11:57| ERROR: No forward-proxy ports configured.
2014/07/03 22:11:57| ERROR: No forward-proxy ports configured.
2014/07/03 22:11:57| ERROR: No forward-proxy ports configured.
2014/07/03 22:11:57| ERROR: No forward-proxy ports configured.
2014/07/03 22:11:57| ERROR: No forward-proxy ports configured.
2014/07/03 22:11:57| ERROR: No forward-proxy ports configured.
2014/07/03 22:11:57| ERROR: No forward-proxy ports configured.
2014/07/03 22:11:57| ERROR: No forward-proxy ports configured.
2014/07/03 22:11:57| ERROR: No forward-proxy ports configured.
2014/07/03 22:11:57| ERROR: No forward-proxy ports configured.
2014/07/03 22:11:57| ERROR: No forward-proxy ports configured.
2014/07/03 22:11:57| Loaded Icons.
2014/07/03 22:11:57| HTCP Disabled.
2014/07/03 22:11:57| Pinger socket opened on FD 13
2014/07/03 22:11:57| Squid plugin modules loaded: 0
2014/07/03 22:11:57| Adaptation support is off.
2014/07/03 22:11:57| Accepting NAT intercepted HTTP Socket connections at local=0.0.0.0:3128 remote=[::] FD 11 flags=41
2014/07/03 22:11:57| Done reading /opt/squid/cache swaplog (2 entries)
2014/07/03 22:11:57| Finished rebuilding storage from disk.
2014/07/03 22:11:57| 2 Entries scanned
2014/07/03 22:11:57| 0 Invalid entries.
2014/07/03 22:11:57| 0 With invalid flags.
2014/07/03 22:11:57| 2 Objects loaded.
2014/07/03 22:11:57| 0 Objects expired.
2014/07/03 22:11:57| 0 Objects cancelled.
2014/07/03 22:11:57| 0 Duplicate URLs purged.
2014/07/03 22:11:57| 0 Swapfile clashes avoided.
2014/07/03 22:11:57| Took 0.08 seconds ( 24.94 objects/sec).
2014/07/03 22:11:57| Beginning Validation Procedure
2014/07/03 22:11:57| Completed Validation Procedure
2014/07/03 22:11:57| Validated 2 Entries
2014/07/03 22:11:57| store_swap_size = 12.00 KB
2014/07/03 22:11:57| ERROR: No forward-proxy ports configured.
2014/07/03 22:11:57| pinger: Initialising ICMP pinger ...
2014/07/03 22:11:57| pinger: ICMP socket opened.
2014/07/03 22:11:57| pinger: ICMPv6 socket opened
2014/07/03 22:11:57| Pinger exiting.
2014/07/03 22:11:58| storeLateRelease: released 0 objects
Iptables 规则
（暂时使用单一接口“eth0”）
iptables -t nat -A PREROUTING -i eth0 -p tcp -m tcp --dport 80 -j DNAT --to-destination 192.168.1.3:3128
iptables -t nat -A PREROUTING -i eth0 -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 3128
iptables -t nat -A POSTROUTING -s 192.168.1.0/24 -o eth0 -j MASQUERADE
客户端配置
问题是我无法在客户端机器上访问互联网使用 Squid 的 IP 作为网关和主 DNS，如下所示。
在 Ubuntu 客户端上
auto eth0
iface eth0 inet static
address 192.168.1.10
netmask 255.255.255.0
gateway 192.168.1.3
dns-nameservers 192.168.1.3
在 Windows 客户端上
当我将 Ubuntu 客户端和dns-nameservers 192.168.1.1Windows 客户端上的 DNS 更改为路由器的同一 IP192.168.1.1而不是 squid IP（192.168.1.3）时，我可以在两者上访问互联网。这可能不是可行的方法，因为页面可能是直接从路由器呈现的，而不是从使用缓存的 squid 服务器呈现的（当然我可以在 /var/log/squid3/cache.log 中看到生成的日志）。我还注意到我的路由器对已访问的页面闪烁，这可能意味着它通过互联网发送请求，而不是从 squid 缓存中获取。
我仍然没有受到威胁。如果在互联网关闭的情况下，我仍然可以通过缓存访问客户端计算机上访问过的页面，我就满足了。
为 Squid 透明代理配置客户端的程序是什么？有人可以指导我吗？
更新 1
root@ubuntu:~# iptables -t nat -L -n -v
Chain PREROUTING (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
0 0 DNAT tcp -- eth0 * 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 to:192.168.1.3:3128
0 0 REDIRECT tcp -- eth0 * 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 redir ports 3128
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
Chain POSTROUTING (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
0 0 MASQUERADE all -- * eth0 192.168.1.0/24 0.0.0.0/0
更新 2
它正在发挥作用在以前的版本中Ubuntu 10.04(lucid)使用 squid 版本Squid Cache: Version 2.7.STABLE7，下面是有效的 squid 配置文件，当客户端的网关和 DNS 设置为 lucid 的 ip 时，我可以在客户端机器上访问互联网：
root@lucid:~# grep -v '^$\|^\s*\#' /etc/squid/squid.conf
acl all src all
acl manager proto cache_object
acl localhost src 127.0.0.1/32
acl to_localhost dst 127.0.0.0/8 0.0.0.0/32
acl localnet src 10.0.0.0/8 # RFC1918 possible internal network
acl localnet src 172.16.0.0/12 # RFC1918 possible internal network
acl localnet src 192.168.0.0/16 # RFC1918 possible internal network
acl mynet src 192.168.1.0/24 # RFC1918 possible internal network
acl SSL_ports port 443 # https
acl SSL_ports port 563 # snews
acl SSL_ports port 873 # rsync
acl Safe_ports port 80 # http
acl Safe_ports port 21 # ftp
acl Safe_ports port 443 # https
acl Safe_ports port 70 # gopher
acl Safe_ports port 210 # wais
acl Safe_ports port 1025-65535 # unregistered ports
acl Safe_ports port 280 # http-mgmt
acl Safe_ports port 488 # gss-http
acl Safe_ports port 591 # filemaker
acl Safe_ports port 777 # multiling http
acl Safe_ports port 631 # cups
acl Safe_ports port 873 # rsync
acl Safe_ports port 901 # SWAT
acl purge method PURGE
acl CONNECT method CONNECT
http_access allow manager localhost
http_access deny manager
http_access allow purge localhost
http_access deny purge
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports
http_access allow localhost
http_access allow mynet
http_access deny all
icp_access allow localnet
icp_access deny all
http_port 3128 transparent
hierarchy_stoplist cgi-bin ?
cache_mem 8 MB
maximum_object_size_in_memory 32 KB
cache_dir ufs /var/spool/squid 2000 16 256
access_log /var/log/squid/access.log squid
refresh_pattern ^ftp: 1440 20% 10080
refresh_pattern ^gopher: 1440 0% 1440
refresh_pattern -i (/cgi-bin/|\?) 0 0% 0
refresh_pattern (Release|Package(.gz)*)$ 0 20% 2880
refresh_pattern . 0 20% 4320
acl shoutcast rep_header X-HTTP09-First-Line ^ICY.[0-9]
upgrade_http0.9 deny shoutcast
acl apache rep_header Server ^Apache
broken_vary_encoding allow apache
extension_methods REPORT MERGE MKACTIVITY CHECKOUT
hosts_file /etc/hosts
offline_mode on
coredump_dir /var/spool/squid
我不确定为什么它不能Ubuntu 14.04在 Squid 版本上运行Squid Cache: Version 3.3.8。我肯定是在新版本的 squid 或新 destro! 中遗漏了一些设置。
答案1
我不确定，但请看一下这个清单：
编辑该squid.conf文件并更改以下行以启用透明代理模式：
http_port 3128
到
http_port 3128 intercept
然后
service squid restart
service squid reload
在 iptables NAT 表中添加一个条目，将内部接口（LAN 端）的入站流量转发到端口 3128 上的 Squid 服务器（假设 eth0 是内部接口，IP 地址为 192.168.1.3）
iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j DNAT --to 192.168.1.3:3128
现在，您可以使用以下命令查看 iptables、默认过滤表和 NAT 表：
iptables -L -t filter
iptables -L -t nat
现在，您可以使用以下命令将 iptable 过滤表添加（附加）到 Squid 的 3128 端口上接受输入
iptables -t filter -A INPUT -p tcp --dport 3128 -j ACCEPT
也可以尝试这个：
即使不使用正向代理，您也需要在配置中同时有一个“拦截”端口和一个“正向代理”端口：
http_port 3129
http_port 3128 intercept
笔记：该transparent选项自 2010 年起已被弃用intercept。
答案2
答案3
错误：（No forward-proxy ports configure在/var/log/squid3/cache.log）
读维基百科。
根据我的经验，透明代理需要 NAT 端口squid.conf（两者皆可）
http_port 3128
http_port 8080 intercept
答案4
在 Ubuntu 14.04 Squid 透明代理版本：3.3.8 中，您必须从配置 http_port 3128 中删除透明代理，我的意思是保留
http_端口 3128
不是
http_port 3128 透明
由于某种原因现在不起作用。