I ran into the IP device tracking issue where clients/servers were seeing duplicate IP addresses. My question is, would turning off gratuitous ARP resolve the issue? It seems to me like the server sends out an ARP packet and receives a response from my switch. Is that what is causing the issue? I have seen posts where people are disabling IPDT with nmsp attach suppress, or ip device tracking maximum 0.
How would turning off gratuitous ARP on a layer 2 switch effect the network? It seems to me like we really don't need or want gratuitous ARP on, and that would also resolve the duplicate ip address detection problem. I look forward to any comments.
i havent tested this so i cant be sure but reading your post and checking against others it looks like a similar issue is known and there is a workaround , the link i provided earlier shows something related
The 'keepalive' probe sent by the switch is a L2 check. As such from the switch's point of view, the IP addresses used as source in the ARPs are not important: this feature can be used on devices with no IP address configured at all, so the IP source of 0.0.0.0 is not relevant.
When the host receives this messages, it replies back and populates the destination IP field with the only IP address available in the received packet, which is its own IP address. This can cause false duplicate IP address alerts, because the host that replies sees its own IP address as both the source and the destination of the packet; refer to the Duplicate IP Address 0.0.0.0. Error Message Troubleshoot article for more information about the duplicate IP address scenario.
Then it links off to this document explaining the duplication further
Hello Team, The inbuild electrical port can not came up after upgrade the new polaris IOS (asr920-universalk9_npe.V169_4_SR688058565_4.SPA.bin), but when insert Electrical SFP and connect the laptop port are came up..Please guide me is there any bug ...
Cisco helps build IT agility and business resiliency by introducing new technology innovations that help
Respond and adapt to disruptions
Accelerate your digital journey and cloud adoption
Transform your operating model with insights and automatio...
Oct 20, 2020 is an inspirational date for many of us in networking industry to be proud of. It is the birthday of Cisco Catalyst 8500 Series Edge Platforms – one of the most powerful purpose-built SD-WAN Edge platforms ever, making up to 60Gbps throughput...
Hi, Hope this can help someone. To connect local network storage, mine is DS1817+. Create port forward and connect thru internet.Do reply here if you have better or easier configuration! =D Configuration on Cisco Router:ip nat inside source stat...
Cisco SD-WAN Cloud OnRamp allows you to simplify and secure connectivity to cloud applications and public clouds. Interested in testing out the latest Cisco Cloud OnRamp solutions?
Sign up to try out various use cases with the Cisco SD-WAN Cloud ...