[Bug 212170] ipfw fwd does not works if defaultgateway is not assigned

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Fri Aug 26 06:32:40 UTC 2016


https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212170

            Bug ID: 212170
           Summary: ipfw fwd does not works if defaultgateway is not
                    assigned
           Product: Base System
           Version: 11.0-RC1
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: yura_doorsfan at mail.ru

Google did not help me.
Easy to repeat:
2 gateways:

1. rl0=1.2.3.2/30, gateway 1.2.3.1
2. rl1 PPPoE (/usr/sbin/ppp) tun0 5.6.7.8 --> 9.10.11.12  netmask 0xffffffff

2 rules:
fwd 9.10.11.12 ip from 5.6.7.8 to not 192.168.0.0/16 out
fwd 1.2.3.1 ip from 1.2.3.2 to not 192.168.0.0/16 out

script:
gwvo=$(/sbin/ifconfig | grep "inet 5.6.7.8" | awk '{print $4}')
usualy give me '9.10.11.12'

if PPPoE provider had been in down before router booted, then 
$(gwvo) took on empty value 
and
/sbin/route change default ${gwvo}
result default route is absent
and
ping -S 1.2.3.2 8.8.8.8
answer me "no route to host"
and
fwd 1.2.3.1 ip from 1.2.3.2 to not 192.168.0.0/16 out
stop forward (and count) packets

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