Strange behaviour of route command

[Tom Judge]

Hi,

While making some changes to the routing table on one of our routers 
today I noticed that "route add" was showing some strange behaviour. 
When adding a route for 128/8 to the table rather than adding 
128.0.0.0/8 it would add 0.0.0.0/8, however adding 10/9 works correctly.

Is this a bug in route or the routing table?

Tom



[root at fw1 /tftpboot]# netstat -rn
Routing tables

Internet:
Destination        Gateway            Flags    Refs      Use  Netif Expire
default            10.0.0.1           UGS         0     4838   bge0
10.0.0.0/8         link#1             UC          0        0   bge0
10.0.0.46          00:11:43:37:2e:2e  UHLW        1        0   bge0   1196
10.0.0.89          00:16:17:e1:ea:bc  UHLW        1       18   bge0    631
10.0.6.0/23        link#3             UC          0        0   bge2
127.0.0.1          127.0.0.1          UH          0      231    lo0

[root at fw1 /tftpboot]# route add 128/8 10.0.0.1
add net 128: gateway 10.0.0.1

[root at fw1 /tftpboot]# netstat -rn
Routing tables

Internet:
Destination        Gateway            Flags    Refs      Use  Netif Expire
0.0.0.0/8          10.0.0.1           UGS         0        0   bge0 =>
default            10.0.0.1           UGS         0     4838   bge0
10.0.0.0/8         link#1             UC          0        0   bge0
10.0.0.1           link#1             UHLW        2        0   bge0
10.0.0.46          00:11:43:37:2e:2e  UHLW        1        0   bge0   1193
10.0.0.89          00:16:17:e1:ea:bc  UHLW        1       84   bge0    612
10.0.6.0/23        link#3             UC          0        0   bge2
127.0.0.1          127.0.0.1          UH          0      231    lo0

[root at fw1 /tftpboot]# route add 128.0/8 10.0.0.1
add net 128.0: gateway 10.0.0.1

[root at fw1 /tftpboot]# netstat -rn
Routing tables

Internet:
Destination        Gateway            Flags    Refs      Use  Netif Expire
0.0.0.0/8          10.0.0.1           UGS         0        0   bge0 =>
default            10.0.0.1           UGS         0     4838   bge0
10.0.0.0/8         link#1             UC          0        0   bge0
10.0.0.1           link#1             UHLW        3        0   bge0
10.0.0.46          00:11:43:37:2e:2e  UHLW        1        0   bge0   1180
10.0.0.89          00:16:17:e1:ea:bc  UHLW        1      131   bge0   1200
10.0.6.0/23        link#3             UC          0        0   bge2
127.0.0.1          127.0.0.1          UH          0      231    lo0
128.0.0.0/8        10.0.0.1           UGS         0        0   bge0

root at fw1 /tftpboot]# route add 10/9 10.0.0.50
add net 128.0: gateway 10.0.0.1

[root at fw1 /tftpboot]# netstat -rn
Routing tables

Internet:
Destination        Gateway            Flags    Refs      Use  Netif Expire
0.0.0.0/8          10.0.0.1           UGS         0        0   bge0 =>
default            10.0.0.1           UGS         0     4838   bge0
10.0.0.0/9         10.0.0.50          UGS         0        0   bge0
10.0.0.0/8         link#1             UC          0        0   bge0
10.0.0.1           link#1             UHLW        3        0   bge0
10.0.0.46          00:11:43:37:2e:2e  UHLW        1        0   bge0   1180
10.0.0.89          00:16:17:e1:ea:bc  UHLW        1      131   bge0   1200
10.0.6.0/23        link#3             UC          0        0   bge2
127.0.0.1          127.0.0.1          UH          0      231    lo0
128.0.0.0/8        10.0.0.1           UGS         0        0   bge0