Description of DHCP Log Information

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问题描述

    In some circumstance, the system may display the following log information:

%Apr  3 15:41:09 2006 JMSDX_MEIJIANG_S9512 DHCPR/4/invalidpkt:

Wrong BOOTP packet!

 

    This log information implies that S9500 has received illegal DHCP packets. However, the information may also be displayed in devices with no DHCP enabled and cause misunderstanding in users. This case is due to S9500 mechanism.

    The processing mechanism of S9500 is to check a packet’s validity and allocate the corresponding software module accordingly. If the corresponding function is not enabled, the packet is dropped directly.

The problem may happen in the following occasions:

1. DHCP packet check-sum is incorrect. DHCP packet has a special field Magic Cookie for checking whether the packet is correct.

2. DHCP packet type is incorrect, namely, it is neither relay packet nor request packet.

3. DHCP packet broadcast flag is incorrect. The packet should have non-zero value only for the highest bit, and zero value for all other bits.

4. The gateway address of the DHCP packet is not of ABC type after relay.

案例信息

案例类型:FAQ
案例号:KMS - 8966
创建时间:2007年1月25日
更新时间:2007年10月25日
发布时间:2007/10/25 4:53:42
文章密级:游客可见
有效期:长期有效
发布者:刘志伟【技术大咖】 [l05671]
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