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Instead of writing 10.0.2.1, I typed 10.0.21... and it has worked.
sol10u7 [~]# route add default 10.0.21
add net default: gateway 10.0.21
sol10u7 [~]# netstat -rn
Routing Table: IPv4
Destination Gateway Flags Ref Use Interface
-------------------- -------------------- ----- ----- ---------- ---------
default 10.0.0.21 UG 1 0
10.0.0.0 10.0.2.16 U 1 0 e1000g0
224.0.0.0 10.0.2.16 U 1 0 e1000g0
127.0.0.1 127.0.0.1 UH 1 54 lo0
I've also tried to use 10.1 and 10.1.1, and another success has been met.
sol10u7 [/etc/krb5]# route add default 10.1
add net default: gateway 10.1
sol10u7 [/etc/krb5]# netstat -rn
Routing Table: IPv4
Destination Gateway Flags Ref Use Interface
-------------------- -------------------- ----- ----- ---------- ---------
default 10.0.2.2 UG 1 0
default 10.0.0.1 UG 1 0
10.0.0.0 10.0.2.16 U 1 24 e1000g0
224.0.0.0 10.0.2.16 U 1 0 e1000g0
127.0.0.1 127.0.0.1 UH 1 58 lo0
sol10u7 [/etc/krb5]# route add default 10.1.1
add net default: gateway 10.1.1
sol10u7 [/etc/krb5]# netstat -rn
Routing Table: IPv4
Destination Gateway Flags Ref Use Interface
-------------------- -------------------- ----- ----- ---------- ---------
default 10.0.2.2 UG 1 0
default 10.0.0.1 UG 1 0
default 10.1.0.1 UG 1 0
10.0.0.0 10.0.2.16 U 1 24 e1000g0
224.0.0.0 10.0.2.16 U 1 0 e1000g0
127.0.0.1 127.0.0.1 UH 1 58 lo0
The deletion works in the same manner.
sol10u7 [~]# route delete default 10.0.21
delete net default: gateway 10.0.21
Nice. Is it a bug, or is it a feature ;-) ?
I know there's a similar IPv6 behaviour - reducing the number of Zeros in address notation, but I didn't know it's also related to IPv4.