relay agent dhcrelay goes crazy

[IMMO WETZEL]

I do see a crazy behavior

Start relay with
    dhcrelay -4 -d -iu br_TB104_TMN  -id br_TB104_DUT 10.160.50.50

on the downstream interface I see
10.160.60.52      10.160.50.50      DHCP    346         DHCP Request  - Transaction ID 0x42cc161a
10.160.50.50      10.160.60.52      DHCP    346         DHCP ACK      - Transaction ID 0x42cc161a
10.160.60.49      10.160.60.52      DHCP    346         DHCP ACK      - Transaction ID 0x42cc161a

on the upstream interface I see
10.160.60.52      10.160.50.50      DHCP    346         DHCP Request  - Transaction ID 0x42cc161a
10.160.50.50      10.160.60.52      DHCP    346         DHCP ACK      - Transaction ID 0x42cc161a
10.160.50.49      10.160.50.50      DHCP    346         DHCP Request  - Transaction ID 0x42cc161a
10.160.50.50      10.160.60.49      DHCP    346         DHCP ACK      - Transaction ID 0x42cc161a
10.160.50.49      255.255.255.255               DHCP    346         DHCP NAK      - Transaction ID 0x42cc161a

It means first the dhcp request goes through the system and the answer handed over backward as well.
But relay agent ip is not filled in the frame

But than the relay agent sends out a further unicast with his own ip as source and with the relay agent ip set, towards the server . client mac address is still correct.
The response is than forwarded to the client with the source ip from the relay agent.

And finally I don't now why a NACK is send from the relay agent towards the dhcp server as broadcast without any NACK from a client.

Any suggestions ?

Mit freundlichen Grüßen / With kind regards

Immo Wetzel

ADTRAN GmbH
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