[strongSwan] sending DHCP RELEASE failed: No buffer space available

[Harald Dunkel]

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On 12/03/16 15:35, Thomas Egerer wrote:
> Moinsen Harald,
> 
> On 12/03/2016 02:52 PM, Harald Dunkel wrote:
>> Hi folks,
> 
>> charon mentions a few lines in syslog every day saying
> 
>> sending DHCP RELEASE failed: No buffer space available
> This error message originates from src/libcharon/plugins/dhcp/dhcp_socket.c It's generated after a sendto failed. Judging from sendto(2): <snip> ENOBUFS The  output queue for a network interface was full.  This generally indicates that the interface has stopped sending, but may be caused by
> transient congestion. (Normally, this does  not occur in Linux.  Packets are just silently dropped when a device queue overflows.) <snap> You have a problem sending your packets. Try netstat (netstat -planou) and check the Send-Q.
> 

netstat -planou shows that the send-q is at 0 *every time* I
looked, even when some DHCP traffic was about to be sent.
Whats the size of a DHCP release, anyway? 342 bytes. How
comes it doesn't run out of buffer space on other much larger
packages to send?


Every helpful hint is highly appreciated.

Harri


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