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Still don't know why the icmp packages from win7 vm could not be redirect to em1. I Check the log, and found the package redirect to em 3, after mangle:FORWARD.

 raw:PREROUTING:policy:3 IN=br100 OUT= PHYSIN=vnet1 SRC=20.0.0.5 DST=222.200.160.2 LEN=60 TOS=0x00 PREC=0x00 TTL=128 ID=312 PROTO=ICMP TYPE=8 CODE=0 ID=1 SEQ=10  
mangle:PREROUTING:policy:1 IN=br100 OUT= PHYSIN=vnet1 SRC=20.0.0.5 DST=222.200.160.2 LEN=60 TOS=0x00 PREC=0x00 TTL=128 ID=312 PROTO=ICMP TYPE=8 CODE=0 ID=1 SEQ=10  
 nat:PREROUTING:rule:1 IN=br100 OUT= PHYSIN=vnet1 SRC=20.0.0.5 DST=222.200.160.2 LEN=60 TOS=0x00 PREC=0x00 TTL=128 ID=312 PROTO=ICMP TYPE=8 CODE=0 ID=1 SEQ=10  
 nat:nova-compute-PREROUTING:return:1 IN=br100 OUT= PHYSIN=vnet1  SRC=20.0.0.5 DST=222.200.160.2 LEN=60 TOS=0x00 PREC=0x00 TTL=128 ID=312 PROTO=ICMP TYPE=8 CODE=0 ID=1 SEQ=10  
 nat:PREROUTING:rule:2 IN=br100 OUT= PHYSIN=vnet1 SRC=20.0.0.5 DST=222.200.160.2 LEN=60 TOS=0x00 PREC=0x00 TTL=128 ID=312 PROTO=ICMP TYPE=8 CODE=0 ID=1 SEQ=10  
 nat:nova-network-PREROUTING:return:2 IN=br100 OUT= PHYSIN=vnet1  SRC=20.0.0.5 DST=222.200.160.2 LEN=60 TOS=0x00 PREC=0x00 TTL=128 ID=312 PROTO=ICMP TYPE=8 CODE=0 ID=1 SEQ=10
nat:PREROUTING:rule:3 IN=br100 OUT= PHYSIN=vnet1 SRC=20.0.0.5 DST=222.200.160.2 LEN=60 TOS=0x00 PREC=0x00 TTL=128 ID=312 PROTO=ICMP TYPE=8 CODE=0 ID=1 SEQ=10
 nat:nova-api-metadat-PREROUTING:return:1 IN=br100 OUT= PHYSIN=vnet1 SRC=20.0.0.5 DST=222.200.160.2 LEN=60 TOS=0x00 PREC=0x00 TTL=128 ID=312 PROTO=ICMP TYPE=8 CODE=0 ID=1 SEQ=10
 nat:PREROUTING:policy:4 IN=br100 OUT= PHYSIN=vnet1 SRC=20.0.0.5 DST=222.200.160.2 LEN=60 TOS=0x00 PREC=0x00 TTL=128 ID=312 PROTO=ICMP TYPE=8 CODE=0 ID=1 SEQ=10
 mangle:FORWARD:policy:1 IN=br100 OUT=br100 PHYSIN=vnet1 PHYSOUT=em3  SRC=20.0.0.5 DST=222.200.160.2 LEN=60 TOS=0x00 PREC=0x00 TTL=128 ID=312 PROTO=ICMP TYPE=8 CODE=0 ID=1 SEQ=10
 filter:FORWARD:rule:1 IN=br100 OUT=br100 PHYSIN=vnet1 PHYSOUT=em3  SRC=20.0.0.5 DST=222.200.160.2 LEN=60 TOS=0x00 PREC=0x00 TTL=128 ID=312 PROTO=ICMP TYPE=8 CODE=0 ID=1 SEQ=10