reincarnation of bug kern/95665: [if_tun] "ping: sendto: No buffer space available"

[Oleg]

Hi All,

I can reproduce this bug easly with tap echo server (attached here), that I
was small reworked.

steps (almost same):
(All ip addresses/macs hardcoded in code).

On first machine run echo server, on second add

root at pc2# route add -net 192.168.125.1/24 ip-addr-of-first-machine

and

root at pc2# ping -f -n 192.168.125.2

While flood pinging, on first machine run ping for checking:

root at pc1#  ping 192.168.125.2
PING 192.168.125.2 (192.168.125.2): 56 data bytes
64 bytes from 192.168.125.2 : icmp_seq=0 ttl=64 time=0.554 ms
64 bytes from 192.168.125.2: icmp_seq=1 ttl=64 time=0.180 ms
...
wait for a while
...
ping: sendto: No buffer space available
ping: sendto: No buffer space available
ping: sendto: No buffer space available

With best regards,
    Oleg Dolgov.
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