How to remove a screwed up route?

[Rodney W. Grimes]

> On Thu, Feb 15, 2018 at 9:47 AM, Scott Ellentuch <tuctboh at gmail.com> wrote:
> 
> > Hi,
> >
> > I did a very foolish thing....
> >
> > route add -net 61.177.172.137 gw 127.0.0.1
> >
> >
> > 1) Thats not a net, thats a host
> > 2) Thats my Linux's syntax, not what I expected
> >
> > So now I have the following in my netstat -rn
> >
> > 61.0.0.1&0x7f000001 MY.GW.IP.HERE       UGSc        1        0   fxp0
> >
> >
> > And I don't know the right magic to delete it.
> >
> > Thanks, Tuc
> >
> >
...
> What version of FreeBSD?  That command did not work on my 11.1-RELEASE-p6
> system.

I suspect the reason for it not working on your system is you do not
have a host called gw, where as this person does.

> 
> 
> root at apron:~ # route add -net 1.2.3.4 gw 127.0.0.1
> route: bad address: gw

Try echo "1.2.3.4 gw" >>/etc/hosts and run the command again,
you should now get an error about unreachable gateway.

> Here's what worked for me.  Just use route del with the same parameters

I believe your correct, if the poster executes the orignal command
with s/add/delete/  the right thing should just happen:

route delete -net 61.177.172.137 gw 127.0.0.1


I believe if one looks at the man page for route:
 route [-n] command [-net | -host] destination gateway [netmask] [-fib number]

you see that what happened here, after dns/hosts file translation was:

route add -net 61.0.0.1 MY.GW.IP.HERE 127.0.0.1

The trailing 127.0.0.1 is interpretted as the netmask, and this
is why you see 60.0.0.1&0x7f000001 as the route entry,
0x7f000001 is 127.0.0.1 in host order hex.


> root at apron:~ # route add -net 1.2.3.4 127.0.0.1
> add net 1.2.3.4: gateway 127.0.0.1
> root at apron:~ # netstat -nr
> Routing tables
> 
> Internet:
> Destination        Gateway            Flags     Netif Expire
> default            10.1.10.1          UGS        bge0
> 1.2.3.4/32         127.0.0.1          UGS         lo0
> 10.0.0.0/8         10.1.10.1          UGS        bge0
> 10.1.10.0/24       link#1             U          bge0
> 10.1.10.175        link#1             UHS         lo0
> 127.0.0.1          link#2             UH          lo0
> 
> Internet6:
> Destination                       Gateway                       Flags
> Netif Expire
> ::/96                             ::1                           UGRS
> lo0
> ::1                               link#2                        UH
> lo0
> ::ffff:0.0.0.0/96                 ::1                           UGRS
> lo0
> fe80::/10                         ::1                           UGRS
> lo0
> fe80::%lo0/64                     link#2                        U
> lo0
> fe80::1%lo0                       link#2                        UHS
> lo0
> ff02::/16                         ::1                           UGRS
> lo0
> 
> root at apron:~ # route del -net 1.2.3.4 127.0.0.1
> del net 1.2.3.4: gateway 127.0.0.1
> root at apron:~ # netstat -nr
> Routing tables
> 
> Internet:
> Destination        Gateway            Flags     Netif Expire
> default            10.1.10.1          UGS        bge0
> 10.0.0.0/8         10.1.10.1          UGS        bge0
> 10.1.10.0/24       link#1             U          bge0
> 10.1.10.175        link#1             UHS         lo0
> 127.0.0.1          link#2             UH          lo0
> 
> Internet6:
> Destination                       Gateway                       Flags
> Netif Expire
> ::/96                             ::1                           UGRS
> lo0
> ::1                               link#2                        UH
> lo0
> ::ffff:0.0.0.0/96                 ::1                           UGRS
> lo0
> fe80::/10                         ::1                           UGRS
> lo0
> fe80::%lo0/64                     link#2                        U
> lo0
> fe80::1%lo0                       link#2                        UHS
> lo0
> ff02::/16                         ::1                           UGRS
> lo0
> root at apron:~ # uname -a
> FreeBSD apron.ad.nyingma.org 11.1-RELEASE-p6 FreeBSD 11.1-RELEASE-p6 #0
> r328506M: Sat Jan 27 23:09:57 PST 2018
> root at apron.ad.nyingma.org:/usr/obj/usr/src/sys/GENERIC
> amd64
> _______________________________________________
> freebsd-net at freebsd.org mailing list
> https://lists.freebsd.org/mailman/listinfo/freebsd-net
> To unsubscribe, send any mail to "freebsd-net-unsubscribe at freebsd.org"
> 
> 

-- 
Rod Grimes                                                 rgrimes at freebsd.org