Bug 15757

Summary: udhcpc: unicast renew fails sporadically
Product: Busybox Reporter: json.wago
Component: NetworkingAssignee: unassigned
Status: NEW ---    
Severity: normal CC: busybox-cvs, json.wago
Priority: P5    
Version: 1.34.x   
Target Milestone: ---   
Hardware: All   
OS: Linux   
Host: Target:
Build:
Attachments: config
pcap of the failed dhcp renew

Description json.wago 2023-09-06 09:04:31 UTC
Created attachment 9631 [details]
config

When using busybox udhcpc in combination with OpenDHCP server, its sometimes observed that udhcpc fails to handle/recognize the ACK for the unicast REQUEST (renew).
The following broadcast renew is handled successfully. This behavior is not observed when using a different dhcp-server like dnsmasq or isc-dhcp-server.

The unhandled dhcp ACK is seen on the interface that udhpc is listening on (via tcpdump).
Comment 1 json.wago 2023-09-06 09:06:55 UTC
Created attachment 9634 [details]
pcap of the failed dhcp renew