[root@hn net]# cat /proc/sys/net/ipv4/conf/eth0/proxy_arp
0

[root@hn net]# cat /proc/sys/net/ipv4/conf/venet0/proxy_arp
0

[root@hn net]# cat /proc/sys/net/ipv4/conf/all/proxy_arp
0

[root@hn net]# iptables -t nat -vnL POSTROUTING
Chain POSTROUTING (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination
    0     0 SNAT       all  --  *      eth0    172.16.0.0/16        0.0.0.0/0           to:27.16.122.72

[root@hn net]# route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
172.16.2.1      *               255.255.255.255 UH    0      0        0 venet0
172.16.4.1      *               255.255.255.255 UH    0      0        0 venet0
172.16.2.2      *               255.255.255.255 UH    0      0        0 venet0
27.16.122.129   *               255.255.255.255 UH    0      0        0 venet0
27.16.122.128   *               255.255.255.255 UH    0      0        0 venet0
27.16.122.131   *               255.255.255.255 UH    0      0        0 venet0
27.16.122.130   *               255.255.255.255 UH    0      0        0 venet0
172.16.1.1      *               255.255.255.255 UH    0      0        0 venet0
172.16.3.1      *               255.255.255.255 UH    0      0        0 venet0
172.16.3.3      *               255.255.255.255 UH    0      0        0 venet0
27.16.122.134   *               255.255.255.255 UH    0      0        0 venet0
27.16.122.0     *               255.255.255.192 U     0      0        0 eth0
169.254.0.0     *               255.255.0.0     U     0      0        0 eth0
default         27.16.122.1     0.0.0.0         UG    0      0        0 eth0

[root@hn ~]# cd /proc/sys/net/ipv4/conf
[root@hn conf]# for i in */*; do echo $i; cat $i; done
all/accept_redirects
0
all/accept_source_route
0
all/arp_announce
0
all/arp_filter
0
all/arp_ignore
0
all/bootp_relay
0
all/disable_policy
0
all/disable_xfrm
0
all/force_igmp_version
0
all/forwarding
1
all/log_martians
0
all/mc_forwarding
0
all/medium_id
0
all/proxy_arp
0
all/rp_filter
0
all/secure_redirects
1
all/send_redirects
0
all/shared_media
1
all/tag
0
default/accept_redirects
1
default/accept_source_route
0
default/arp_announce
0
default/arp_filter
0
default/arp_ignore
0
default/bootp_relay
0
default/disable_policy
0
default/disable_xfrm
0
default/force_igmp_version
0
default/forwarding
1
default/log_martians
0
default/mc_forwarding
0
default/medium_id
0
default/proxy_arp
0
default/rp_filter
1
default/secure_redirects
1
default/send_redirects
1
default/shared_media
1
default/tag
0
eth0/accept_redirects
1
eth0/accept_source_route
0
eth0/arp_announce
0
eth0/arp_filter
0
eth0/arp_ignore
0
eth0/bootp_relay
0
eth0/disable_policy
0
eth0/disable_xfrm
0
eth0/force_igmp_version
0
eth0/forwarding
1
eth0/log_martians
0
eth0/mc_forwarding
0
eth0/medium_id
0
eth0/proxy_arp
0
eth0/rp_filter
1
eth0/secure_redirects
1
eth0/send_redirects
1
eth0/shared_media
1
eth0/tag
0
lo/accept_redirects
1
lo/accept_source_route
0
lo/arp_announce
0
lo/arp_filter
0
lo/arp_ignore
0
lo/bootp_relay
0
lo/disable_policy
0
lo/disable_xfrm
0
lo/force_igmp_version
0
lo/forwarding
1
lo/log_martians
0
lo/mc_forwarding
0
lo/medium_id
0
lo/proxy_arp
0
lo/rp_filter
1
lo/secure_redirects
1
lo/send_redirects
1
lo/shared_media
1
lo/tag
0
venet0/accept_redirects
1
venet0/accept_source_route
0
venet0/arp_announce
0
venet0/arp_filter
0
venet0/arp_ignore
0
venet0/bootp_relay
0
venet0/disable_policy
0
venet0/disable_xfrm
0
venet0/force_igmp_version
0
venet0/forwarding
1
venet0/log_martians
0
venet0/mc_forwarding
0
venet0/medium_id
0
venet0/proxy_arp
0
venet0/rp_filter
1
venet0/secure_redirects
1
venet0/send_redirects
0
venet0/shared_media
1
venet0/tag
0

[root@hn ~]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:0E:0C:83:4A:90
          inet addr:27.16.122.72  Bcast:27.16.122.108  Mask:255.255.255.192
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:386 errors:0 dropped:0 overruns:0 frame:0
          TX packets:387 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:41379 (40.4 KiB)  TX bytes:46938 (45.8 KiB)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:417 errors:0 dropped:0 overruns:0 frame:0
          TX packets:417 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:36545 (35.6 KiB)  TX bytes:36545 (35.6 KiB)

venet0    Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
          UP BROADCAST POINTOPOINT RUNNING NOARP  MTU:1500  Metric:1
          RX packets:18 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:2029 (1.9 KiB)  TX bytes:1901 (1.8 KiB)