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Why adding default gateway for raspberry pi failed?

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Last Modified: 2017-12-13
This is using a raspberry-pi. My co-worker has defined a bridge called br-lan on top of the physical eth0. Please see attached docx for ifconfig command. Please also see the networking settings on /etc/network/interfaces, /etc/network/interfaces.d/br-lan, and /etc/dhcpcd.conf files. See the ip addressing settings of br-lan as follows:

       ip - 192.168.100.199
       mask - 255.255.255.0
      default gateway - 192.168.100.2
     dns - 203.211.152.66

However, the default gateway setting doesn't seem to work. Please see the results of route -n. I also try to set br-lan to dhcp, and the result is, eth0 grabs the ip - 192.168.100.199.

Appreciate for any help. Thanks in advance.
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