为什么不同的用户通过相同的接口获得不同的IP

在同一台服务器上，在root上，我得到了正确的界面互联网IP

root@server:~# curl -s --interface ppp0 ipcheck.com
111.111.111.111root@server:~# 

然而...

如果它不是超级用户，我得到默认路由/接口eth0或eth1 internet ip的ip而不是ppp0的internet ip，这不是我所期望的。

matrix@server:~$ curl -s --interface ppp0 ipcheck.com
222.222.222.222matrix@server:~$ 

我的问题是为什么不同的用户获得不同的IP /路由？它是相同的应用程序，我已正确设置路由的相同界面...

在/ etc / iproute2 / rt_tables中，我添加了

    20      isp1
    30      isp2
    40      ppp0
    50      ppp1
    60      ppp2

ip route的前3行：

    default 
        nexthop via 222.222.222.1  dev eth0 weight 1
        nexthop via 222.222.222.2  dev eth1 weight 1
10.200.20.1 dev ppp0  proto kernel  scope link  src 10.200.21.4
10.200.20.1 dev ppp1  proto kernel  scope link  src 10.200.21.9 
10.200.20.1 dev ppp2  proto kernel  scope link  src 10.200.21.7 

ip规则：

0:  from all lookup local 
32761:  from all fwmark 0x60 lookup ppp2 
32762:  from all fwmark 0x50 lookup ppp1
32763:  from all fwmark 0x40 lookup ppp0 
32764:  from all fwmark 0x30 lookup ISP2 
32765:  from all fwmark 0x20 lookup ISP1 
32766:  from all lookup main 
32767:  from all lookup default 

iptables的：

    -A PREROUTING -t mangle -i eth0 -m state --state NEW,RELATED,ESTABLISHED -d 222.222.222.222 -j CONNMARK --set-mark 0x20
    -A PREROUTING -t mangle -i eth1 -m state --state NEW,RELATED,ESTABLISHED -d 222.222.222.223 -j CONNMARK --set-mark 0x30
    -A PREROUTING -t mangle -i br0 -m connmark --mark 0x20 -j CONNMARK --restore-mark
    -A PREROUTING -t mangle -i br0 -m connmark --mark 0x30 -j CONNMARK --restore-mark
    -A OUTPUT -t mangle -m state --state ESTABLISHED,RELATED -j CONNMARK --restore-mark
-A PREROUTING -t mangle -i ppp0 -m state --state NEW,RELATED,ESTABLISHED -d 10.200.21.4 -j CONNMARK --set-mark 0x40
-A PREROUTING -t mangle -i br0 -m connmark --mark 0x40 -j CONNMARK --restore-mark
-A PREROUTING -t mangle -i ppp1 -m state --state NEW,RELATED,ESTABLISHED -d 10.200.21.9 -j CONNMARK --set-mark 0x50
-A PREROUTING -t mangle -i br0 -m connmark --mark 0x50 -j CONNMARK --restore-mark
-A PREROUTING -t mangle -i ppp2 -m state --state NEW,RELATED,ESTABLISHED -d 10.200.21.7 -j CONNMARK --set-mark 0x60
-A PREROUTING -t mangle -i br0 -m connmark --mark 0x60 -j CONNMARK --restore-mark

-A OUTPUT -t mangle -m state --state ESTABLISHED,RELATED -j CONNMARK --restore-mark


    -A POSTROUTING -t nat -o eth0 -j MASQUERADE
    -A POSTROUTING -t nat -o eth1 -j MASQUERADE
    -A POSTROUTING -t nat -o ppp+ -j MASQUERADE

    -A FORWARD -i br0 -o eth0 -j ACCEPT
    -A FORWARD -i br0 -o eth1 -j ACCEPT
    -A FORWARD -i br0 -o ppp+ -j ACCEPT
    -A FORWARD -m state -i eth0 -o br0 --state ESTABLISHED,RELATED -j ACCEPT
    -A FORWARD -m state -i eth1 -o br0 --state ESTABLISHED,RELATED -j ACCEPT
    -A FORWARD -m state -i ppp+ -o br0 --state ESTABLISHED,RELATED -j ACCEPT
    -A FORWARD -i br0 -o br0 -j ACCEPT