FreeBSD eats 169.254.x.x addressed packets
Stephen Clark
sclark46 at earthlink.net
Tue Jun 8 18:26:13 UTC 2010
On 06/08/2010 02:05 PM, Jeremy Chadwick wrote:
> On Tue, Jun 08, 2010 at 01:45:59PM -0400, Stephen Clark wrote:
>> Why does FreeBSD 6.3 eat 169.254.x.x addressed packet when
>> 4.9 didn't?
>
> The following output would help:
>
> - ifconfig -a
> - netstat -rn
> - Contents of /etc/rc.conf
>
> Also, be aware that RELENG_6 is to be EOL'd at the end of this year:
> http://security.freebsd.org/
>
Hi Jeremy,
I am not sure that information is relevant. We have two systems configured
identically one using 4.9 the other 6.3.
We were replacing the 4.9 system with the 6.3 system.
The internal lan had been setup on the 4.9 box using dhcpd
handing out ip addresses in the 169.254.202/24 range.
This box had been working for years.
When we replaced it with the identically configured 6.3 box
we could no longer ping the internal interface which had an ip
address of 169.254.202.1. So after spending about a day trouble
shooting we finally realized if we changed the address to
169.253.202.1 everything worked on the 6.3 box.
Investigating the 169.254.x.x address shows it is normally used
when a box can't get an address using dhcp so it assigns one randomly
from the 169.254.x.x address space.
I don't know what happened with 6.3 but any 6.3 box we assign and address
in that range then you can't ping the address.
This is from another box.
srmrd# ifconfig bge0 169.254.1.1
srmrd# ping 169.254.1.1
PING 169.254.1.1 (169.254.1.1): 56 data bytes
^C
--- 169.254.1.1 ping statistics ---
3 packets transmitted, 0 packets received, 100% packet loss
srmrd# netstat -rn
Routing tables
Internet:
Destination Gateway Flags Refs Use Netif Expire
default 192.168.198.252 UGS 0 2711166 fxp0
10.0.128/17 link#1 UC 0 0 fxp0
10.0.128.1 00:30:18:a3:47:a5 UHLW 1 3805 fxp0 1155
10.0.129.5 00:00:24:ca:65:ec UHLW 1 33348 fxp0 1154
10.0.129.91 00:1c:c0:94:3a:12 UHLW 1 149 fxp0 773
10.0.129.101 00:b0:d0:fe:89:d9 UHLW 1 58 lo0
127.0.0.1 127.0.0.1 UH 0 18437 lo0
169.254 link#2 UC 0 0 bge0
169.254.1.1 00:b0:d0:fe:89:da UHLW 1 3 lo0
192.168.198 link#1 UC 0 0 fxp0
192.168.198.94 00:02:b6:36:e9:4a UHLW 1 1490 fxp0 1113
192.168.198.98 00:90:c2:c7:5e:78 UHLW 1 3369 fxp0 255
192.168.198.101 00:04:23:b6:da:8d UHLW 1 1458 fxp0 1153
192.168.198.252 00:30:18:a3:47:90 UHLW 2 0 fxp0 1144
192.168.198.253 00:30:18:a3:47:a3 UHLW 1 25662 fxp0 801
Internet6:
Destination Gateway Flags Netif
Expire
::1 ::1 UHL lo0
fe80::%lo0/64 fe80::1%lo0 U lo0
fe80::1%lo0 link#4 UHL lo0
ff01:4::/32 fe80::1%lo0 UC lo0
ff02::%lo0/32 fe80::1%lo0 UC lo0
srmrd# uname -a
FreeBSD srmrd.com 6.3-RELEASE-p13 FreeBSD 6.3-RELEASE-p13 #1: Tue Oct 13
09:07:05 EDT 2009 root at srmrd..com:/usr/src/sys/i386/compile/SMP i386
**************************
Here I added an alias ip
srmrd# ifconfig bge0 alias 169.253.1.1
srmrd# ping 169.253.1.1
PING 169.253.1.1 (169.253.1.1): 56 data bytes
64 bytes from 169.253.1.1: icmp_seq=0 ttl=64 time=0.082 ms
64 bytes from 169.253.1.1: icmp_seq=1 ttl=64 time=0.055 ms
64 bytes from 169.253.1.1: icmp_seq=2 ttl=64 time=0.056 ms
64 bytes from 169.253.1.1: icmp_seq=3 ttl=64 time=0.053 ms
64 bytes from 169.253.1.1: icmp_seq=4 ttl=64 time=0.061 ms
^C
--- 169.253.1.1 ping statistics ---
5 packets transmitted, 5 packets received, 0% packet loss
round-trip min/avg/max/stddev = 0.053/0.061/0.082/0.011 ms
srmrd# netstat -rn
Routing tables
Internet:
Destination Gateway Flags Refs Use Netif Expire
default 192.168.198.252 UGS 0 2711166 fxp0
10.0.128/17 link#1 UC 0 0 fxp0
10.0.128.1 00:30:18:a3:47:a5 UHLW 1 3805 fxp0 892
10.0.129.5 00:00:24:ca:65:ec UHLW 1 33356 fxp0 1128
10.0.129.91 00:1c:c0:94:3a:12 UHLW 1 274 fxp0 510
10.0.129.101 00:b0:d0:fe:89:d9 UHLW 1 58 lo0
127.0.0.1 127.0.0.1 UH 0 18437 lo0
169.253 link#2 UC 0 0 bge0
169.253.1.1 00:b0:d0:fe:89:da UHLW 1 10 lo0
169.254 link#2 UC 0 0 bge0
169.254.1.1 00:b0:d0:fe:89:da UHLW 1 3 lo0
192.168.198 link#1 UC 0 0 fxp0
192.168.198.94 00:02:b6:36:e9:4a UHLW 1 1490 fxp0 1090
192.168.198.98 00:90:c2:c7:5e:78 UHLW 1 3394 fxp0 1196
192.168.198.101 00:04:23:b6:da:8d UHLW 1 1458 fxp0 1100
192.168.198.252 00:30:18:a3:47:90 UHLW 2 0 fxp0 1182
192.168.198.253 00:30:18:a3:47:a3 UHLW 1 25662 fxp0 1187
Regards,
Steve
--
"They that give up essential liberty to obtain temporary safety,
deserve neither liberty nor safety." (Ben Franklin)
"The course of history shows that as a government grows, liberty
decreases." (Thomas Jefferson)
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