collisions on tun interfaces ...

[Zeus V Panchenko]

Hi,

may somebody epxplain it for me, what can cause collisions on tun
interfaces created by ppp(8) and openvpn?

> uname -a
FreeBSD 8.2-STABLE #0 i386

> netstat -i
Name    Mtu Network       Address              Ipkts Ierrs Idrop    Opkts Oerrs  Coll
tun0   1492 <Link#7>                        18940349     0     0 15737760     0 45668
tun0   1492 A.B.C.D A-B-C-D.domain          15623965     -     - 12429351     -     -
tun1   1500 <Link#8>                        12721670     0     0  9957662     0 11161
tun1   1500 E.F.G.H E-F-G-H.vpn     	        6454     -     -   445751     -     -


rl0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
     options=3808<VLAN_MTU,WOL_UCAST,WOL_MCAST,WOL_MAGIC>
     ether 00:30:4f:67:cf:81
     media: Ethernet autoselect (100baseTX <full-duplex>)
     status: active
tun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> metric 0 mtu 1492
      options=80000<LINKSTATE>
      inet A.B.C.D --> A1.B1.C1.D1 netmask 0xffffffff 
      Opened by PID 3943
tun1: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> metric 0 mtu 1500
      options=80000<LINKSTATE>
      inet E.F.G.H --> E1.F1.G1.H1 netmask 0xffffffff 
      Opened by PID 1387

tun0 is created by ppp(8)

in /etc/ppp.conf is:
default:
 set log Phase Chat LCP IPCP CCP tun command
 set server /var/run/ppp/internet "" 0177
 set device PPPoE:rl0
 set speed sync
 enable lqr echo
 set lqrperiod 30
 set login
 set ctsrts off
 add default HISADDR
 set timeout 0
 set redial 0 0
 set cd 5

tun1 is created by OpenVPN with configuration:
client
dev tun1
proto udp
...

so, what can cause the collisions and can i fix them?

-- 
Zeus V. Panchenko
IT Dpt., IBS ltd			      	        GMT+2 (EET)