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TCP/IP communication issue

V Krishana Rao Racharla

Hi, i have a TCP/IP communication issue with my device, which is whenever i set my device or PC's IP address last octet to odd then i am not able communicate with PC (ping is not working) after debugging i have seen following message while sending response ethernet frame which is "ETH-ERR: Send, Unresolved MAC address for IP of 192.168.1.200(PC ip address). with my device last octet set to even communication is working fine.
I request forum members to let me know the cause or atleast a way to debug and isolate the issue. so that i can fix this bug.
Examples:

With below settings communication is okay
Device address: 192.168.1.100
PC address: 192.168.1.200

With below settings communication is not working

Device address: 192.168.1.101
PC address: 192.168.1.200

or

Device address: 192.168.1.100
PC address: 192.168.1.201

Device config:
Processor LPC1788,
RTOS: KEIL RTX
Library: RL-ARM (TCP/IP, USB, etc)
Phy layer: Ethernet.

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