Access Google docs

Add following URL address in c:windowssystem32driversetchosts

 

209.85.147.109 pop.gmail.com
209.85.147.109 smtp.gmail.com
66.102.7.19 mail.google.com
209.85.225.101 docs.google.com
74.125.227.2 docs.google.com
74.125.227.2 docs0.google.com
74.125.227.2 docs1.google.com
74.125.227.2 docs2.google.com
74.125.227.2 docs3.google.com
74.125.227.2 spreadsheets.google.com
74.125.227.2 spreadsheets0.google.com
74.125.227.2 spreadsheets1.google.com
74.125.227.2 spreadsheets2.google.com
74.125.227.2 spreadsheets3.google.com
209.85.225.102 groups.google.com
74.125.127.139 spreadsheets.google.com
74.125.127.100 services.google.com
74.125.127.100 writely.google.com
74.125.127.100 sites.google.com
209.85.225.104 reader.google.com
74.125.127.101 calendar.google.com
74.125.39.99 chrome.google.com
74.125.39.99 clients2.google.com

Android SDK download URL

http://developer.android.com/sdk/index.html

http://dl.google.com/android/repository/repository.xml

http://dl-ssl.google.com/android/repository/repository.xml

http://dl-ssl.google.com/android/repository/repository-5.xml

http://dl-ssl.google.com/android/repository/addons_list-1.xml

http://dl-ssl.google.com/android/repository/addon.xml

 

 

Dual NIC configuration on Ubuntu

Suppose there are two NIC on one Ubuntu box:

nic0:   eth0 
        ip=192.168.127.88
        gateway=192.168.127.2
       

nic1:   eth1
        ip=172.24.220.72
        gateway=172.24.220.1

 

And the original networking configuration is:

> netstat -arp

172.24.0.0       *                    255.255.0.0     U          0 0            0 eth1
link-local           *                   255.255.0.0     U          0 0            0 eth0
192.168.0.0     *                    255.255.0.0     U          0 0            0 eth0
default         192.168.127.2   0.0.0.0            UG         0 0           0 eth0

 

In the above network configuration,   eth0 will be used as default gateway of server, all output traffic will go through eth0, except the target address is 172.24.0.0/16.

 

issue:

if one 172.24.0.0/16  client access service via eth0, the return IP trafic will go through eth1, instead of erh0, according to the route table.

 

Solution:  Using policy route mechanism of linux:

 

Step 1 ******    Add extra route table for eth1 & eth0:

    # echo “251   eth1” >>/etc/iproute2/rt_tables

    # echo “250   eth1” >>/etc/iproute2/rt_tables

 

Step 2 ******   Setup eth1 route table:

    #  ip route add 172.24.220.0/24 dev eth1 src 172.24.220.72 table eth1
    #  ip route add default via 172.24.220.1 dev eth1 table eth1

    # ip route add 192.168.127.0/24 dev eth0 src 192.168.127.88 table eth0
    # ip route add default via 192.168.127.2 dev eth0 table eth0

 

Step 3 ******   Setup rule of eth0 & eth1 table:

  # ip rule del prio 1000
  # ip rule del prio 2000

  # ip rule add from 172.24.220.72/16  table eth1 prio 1000
  # ip rule add from 192.168.127.88/16 table eth0 prio 2000

 

Step 4 ******   Remove eth1 entry in the default  table:

  # sudo route del -net 172.24.0.0/16

 

Step 5 ******   Clean route table cache

 # sudo ip -s -s route flush cache

 

Example:

# cat  /etc/network/interfaces

auto lo
iface lo inet loopback

auto  eth0
iface eth0 inet dhcp

auto eth1
iface eth1 inet dhcp
    post-up /etc/init.d/seteth1mask.sh

 

#cat  /etc/init.d/seteth1mask.sh

#! /bin/sh
/sbin/ifconfig eth1 netmask 255.255.0.0
/sbin/route add -host 172.24.61.252 gw 192.168.127.2 dev eth0

ip route add 172.24.220.0/24 dev eth1 src 172.24.220.72 table eth1
ip route add default via 172.24.220.1 dev eth1 table eth1

ip route add 192.168.127.0/24 dev eth0 src 192.168.127.88 table eth0
ip route add default via 192.168.127.2 dev eth0 table eth0

ip rule del prio 1000
ip rule del prio 2000

ip rule add from 172.24.220.72/16 table eth1 prio 1000
ip rule add from 192.168.127.88/16 table eth0 prio 2000

ip route flush cache
/sbin/route del -net 172.24.0.0/16

 

 

****** Note ******

  Before network link switch on windows xp/samba client,  need to clean the network cache on windows system by logout action