Deleting a route from the routing table in Linux should be simple. However, the syntax of the route command can be a little fussy.
I wanted to remove the first entry in the routing table shown below:
Destination Gateway Genmask Flags MSS Window irtt Iface
172.26.62.25 10.149.57.129 255.255.255.255 UGH 0 0 0 eth4.2251
10.149.55.128 * 255.255.255.240 U 0 0 0 eth3.2261
10.149.57.128 * 255.255.255.240 U 0 0 0 eth4.2251
link-local * 255.255.0.0 U 0 0 0 eth3.2261
link-local * 255.255.0.0 U 0 0 0 eth4.2251
default 10.149.55.129 0.0.0.0 UG 0 0
The correct command is at the bottom of this page. However, all of the following failed with the errors shown.
Failed command and its possible Errors
# route delete 172.26.62.25/32 10.149.57.129
SIOCDELRT: No such device
# route delete 172.26.62.25 10.249.57.129
SIOCDELRT: No such device
and
# route del 172.26.62.25 10.149.57.129
SIOCDELRT: No such device
# route del 172.26.62.25/32 10.149.57.129
SIOCDELRT: No such device
# route del -host 172.26.62.25 10.149.57.129
SIOCDELRT: No such device
and
# ip route del 172.26.62.25 10.149.57.129
Error: either "to" is duplicate, or "10.149.57.129" is a garbage.
# route del -host 172.26.62.25 reject
SIOCDELRT: No such process
# route del -host 172.26.62.25/32 reject
SIOCDELRT: No such process
# route del 172.26.62.25/32 reject
SIOCDELRT: No such process
# ip route del 172.26.62.25/32 reject
Error: either "to" is duplicate, or "reject" is a garbage.
and
# route del -host 172.26.62.25 netmask 255.255.255.255 reject
route: netmask 00000000 doesn't make sense with host route
But this works:
# route del -host 172.26.62.25 gw 10.149.57.129
# netstat -r
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
10.149.55.128 * 255.255.255.240 U 0 0 0 eth3.2161
10.149.57.128 * 255.255.255.240 U 0 0 0 eth4.2251
link-local * 255.255.0.0 U 0 0 0 eth3.2261
link-local * 255.255.0.0 U 0 0 0 eth4.2251
default 10.149.55.129 0.0.0.0 UG 0 0
Hope you like this post ... Cheers !!
