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Answer:
The arp table becomes empty after the first "ifconfig eth1 down"
[root@localhost ~]# arp -n
Address HWtype HWaddress Flags Mask Iface
142.204.141.131 ether 00:0E:7F:3C:A8:F3 C eth1
142.204.141.129 ether 00:0E:0C:4B:31:5C C eth1
[root@localhost ~]# ifconfig eth1 down
[root@localhost ~]# arp -n
[root@localhost ~]# ifconfig eth1 up
[root@localhost ~]# arp -n