dhclient: send_packet: No buffer space available

[Pertti Kosunen]

Chuck Swiger wrote:

> Typically, that sort of message indicates that the firewall rules are 
> preventing traffic from going out, or packets are getting stuck in a 
> queue until it fills up, or maybe even a bug somewhere in the 
> particular combination of kernel firewall options enabled, high 
> optimization or CPUTYPE settings, and your particular hardware, 
> depending on how lucky you are. :-)
>
> Does the problem go away if you use a trivial "permit all" PF ruleset?
> Does the problem go away if you use a trivial IPFW "permit all" 
> instead of PF?
> Does the problem go away if you use a stock 5.4 release kernel?
>
> The 3Com 3c905B-TX is an OK NIC, apparently the later C revision or 
> the 918/920's are pretty decent, but anyway--
>
> ...does the problem go away if you switch to another (known good) NIC?
>
System was ok with 5.3-RELEASE & custom kernel with ipfw. PF logs all 
block rules and nothing gets to pflog on those dhclient errors. I try 
those tips you gave, thanks. Stuck in a queue sounds most likely to be 
the case.