B----------------Linux--------------A(x.y.z.19)
eth0 eth1
I was setup proxy arp with linux(kernel 2.0.32).
1. linux routing table
Destination gateway genmask ... Iface
x.y.z.19 0.0.0.0 255.255.255.255 eth0
x.y.z.0 0.0.0.0 255.255.255.255 eth1
127.0.0.0 0.0.0.0 255.0.0.0 lo
0.0.0.0 x.y.z.2 0.0.0.0
eth0
2. Linux arp table
Address HWtype HWaddress Flag
Mask Iface
x.y.z.19 ether xxx...(eth0's HWaddress)
CMP eth0
x.y.z.0 ether xxx...(eth1's HWaddress) CMP
255.255.255.0 eth1
A can communicate with B.
but if B is cisco router or Sun(SunOs 5.5.1) or switch, A cannot
communicate with B
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