如何为鱿鱼透明代理设置客户端？

Question

服务器详情

Squid Transparent Proxy Version: 3.3.8
OS: Ubuntu Server 14.04
Server IP: 192.168.1.3

鱿鱼配置文件

（不包括使用 grep 的评论）

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

鱿鱼原木

-------------------------------------------------------------
-----------------------------------------------------------
----------------------------------------------------------
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

问题是我无法在我的客户端机器上使用 Squid 的 IP 作为网关和主 DNS访问互联网，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dns-nameservers 192.168.1.1和 Windows 客户端上的DNS 更改为路由器的相同 ip192.168.1.1而不是鱿鱼 ip(192.168.1.3) 时，我就可以在两者上访问互联网。这可能不是办法，因为页面可能直接从路由器呈现，也可能不是来自使用缓存的鱿鱼服务器（当然，我可以看到在 /var/log/squid3/cache.log 中生成的日志）。我还注意到我的路由器为已经访问过的页面闪烁，这可能意味着它通过互联网发送请求，而不是从鱿鱼缓存中获取。

我仍然没有妥协。如果我仍然可以在互联网关闭的情况下从缓存访问客户端机器上访问过的页面，我会很满意。

为 Squid 透明代理配置客户端的程序是什么？有人指导我吗？

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Ubuntu 10.04(lucid)使用鱿鱼版本在以前的版本上工作Squid Cache: Version 2.7.STABLE7，下面是鱿鱼配置文件工作，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适Ubuntu 14.04用于 Squid 版本Squid Cache: Version 3.3.8。我肯定在新版本的鱿鱼或新的 destro! 中缺少一些设置。

Answer 1

我不确定，但请看一下这个清单：

编辑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）上的入站流量端口转发到端口 3128 上的 Squid 服务器（假设 eth0 是 IP 地址为 192.168.1.3 的内部接口）

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您的 iptables、默认过滤器表和 NAT 表：

iptables -L -t filter

iptables -L -t nat

现在您可以使用以下命令添加（附加）到 iptable 过滤器表，以接受 Squid 端口 3128 上的输入

iptables -t filter -A INPUT -p tcp --dport 3128 -j ACCEPT

也试试这个：

即使您不使用转发代理，您在配置中也需要一个“拦截”和一个“转发代理”端口：

http_port 3129 

http_port 3128 intercept

注意：自 2010 年以来，该transparent选项已被intercept选项弃用。

Answer 2

根据Squid WiKi，您在http_port选项中的设置错误，对于 Squid 3.1+ 和 DNAT，它应该intercept而不是transparent.

http_port 3128 intercept

尽管您的 Squid 日志的输出似乎确实表明拦截的套接字处于活动状态。

第二件事是 Linux 服务器需要允许 TCP-IP 转发sysctl net.ipv4.ip_forward=1