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Copy pktj.conf into chroot
touch /tmp/abc
/mnt/build/build/app/build/pktj  --log-level 8 -l 0,1,2,3,4 -n 1 -- --configfile /mnt/build/conf/pktj.conf
gdb /mnt/build/build/app/build/pktj /tmp/core

debug:
build dpdk with something like `make RTE_KERNELDIR=/usr/src/linux-3.18.10-dpdk O=build_kvm EXTRA_CFLAGS="-g -O0"`
vm: gdbserver /dev/ttyS1 /mnt/build/app/build/l3fwd ....
host: gdb ./l3fwd
      gdb> target remote | socat unix-connect:/tmp/tmp.XXXXXXXX/vm-r2-serial.pipe -




#  ip a add 1.0.0.1/31 dev vEth0_0
#  ip a add 2001:1::1/127 dev vEth0_0
#  ip a add 1.0.0.3/31 dev vEth1_0
#  ip a add 2001:1::3/127 dev vEth1_0
#  ip l set vEth0_0 up
#  ip l set vEth1_0 up


Fastpath:
  ssh r3 ping 1.0.1.254
  ssh r2 tcpdump -i vEth0_0 -n -vvv