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ARP Probe question

ARP Probe question

Created: Nov 24, 2021 20:50:50Latest reply: Dec 2, 2021 09:01:10 277 6 0 0 0
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Hi Team,


I have a question with regard to ARP Probe packets. In the logging of an CE6880 we saw a couple of logs:

%ARP/4/ARP_IP_CONFLICT_DETECT

%ARP/4/ARP_DUPLICATE_IPADDR

This messages happens often on the network with different MAC addresses that want to take the address of the default gateway.


After investigation, we have noticed no Rogue DHCP servers and that clients do not actually take on the gateway address but send out an ARP Probe packet. I have read online that an ARP Probe packet is meant for Duplicate Address Detection. But I have a couple of questions.


1. On client level, when does a client send out an ARP Probe? Is this before the DHCP request process?

2. Can I somehow prevent clients from asking if the gateway address is available?


Thank you!

ARPCloud EngineNetworkIPARP Probe

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chenhui
Admin Created Nov 25, 2021 06:09:37

Hi,
1. On client level, when does a client send out an ARP Probe? Is this before the DHCP request process?
====== Usually, the gratuitous ARP packet is sent by the DHCP client. DHCP client will send gratuitous ARP packet after it receives the DHCP ACK packet from the DHCP server.

2. Can I somehow prevent clients from asking if the gateway address is available?
====== Well, I don't think that is caused due to the client sending the ARP probe message. The gratuitous ARP packet is sent when the client wants to detect the potential IP address confliction, in other words, the client device declares that it owns the IP address. Actually, this IP is the default gateway. So, I would suggest that you make an inspection of whether the client is configured with the static IP address, which causes it to send the ARP probe messages.
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chantha
chantha Created Nov 25, 2021 06:53:25 (0) (0)
 
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Gustavo.HdezF
Gustavo.HdezF Admin Created Nov 24, 2021 21:03:24

Hello User. we are reviewing your question and we will answer you shortly. Thanks.
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futurework
futurework Created Nov 24, 2021 21:23:10

good
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chenhui
chenhui Admin Created Nov 25, 2021 06:09:37

Hi,
1. On client level, when does a client send out an ARP Probe? Is this before the DHCP request process?
====== Usually, the gratuitous ARP packet is sent by the DHCP client. DHCP client will send gratuitous ARP packet after it receives the DHCP ACK packet from the DHCP server.

2. Can I somehow prevent clients from asking if the gateway address is available?
====== Well, I don't think that is caused due to the client sending the ARP probe message. The gratuitous ARP packet is sent when the client wants to detect the potential IP address confliction, in other words, the client device declares that it owns the IP address. Actually, this IP is the default gateway. So, I would suggest that you make an inspection of whether the client is configured with the static IP address, which causes it to send the ARP probe messages.
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  • x
  • convention：

chantha
chantha Created Nov 25, 2021 06:53:25 (0) (0)
 
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alvaro_tombokan
alvaro_tombokan Created Nov 26, 2021 07:50:34

Posted by chenhui at 2021-11-25 06:09 Hi,1. On client level, when does a client send out an ARP Probe? Is this before the DHCP request pro ...
Hi Chenhui,

Thank you for your reply and explanation :).
I did some more research and found the following documents:
https://support.huawei.com/enterprise/en/knowledge/EKB1100047263
https://support.huawei.com/enterprise/en/knowledge/EKB1100057529

I do not think that the clients use a static address since there are a lot of different clients.

With kind regards,

Alvaro Tombokan
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chenhui
chenhui Admin Created Dec 2, 2021 09:01:10

Posted by alvaro_tombokan at 2021-11-26 07:50 Hi Chenhui,Thank you for your reply and explanation :).I did some more research and found the foll ...
Hi,
Is it possible to locate the device that leads the confilication?
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