can not ping from inside of a freenas jail

Hi,
I've spent several days tring to solve this issue. I can not ping anything from insdie of a jail, this just hangs and throws a time-out error (no working with kind of standard ip as: google.com and 8.8.8.8). Even I can not ping my router (192.168.1.1). In the freenas it self I have no problem, it is just in the jails. I have tried with FeeeNAS 11.2-U7 and 11.3, and in both the same issue. Also with different jail RELEASES (11.2, 11.3, 11.4).

Just a remark, my freenas runs in a VirtualBox .

Hereunder my configs that might be related to the issue:

allow_raw_sockets is enabled

==============

root@jail01:~ # ifconfig
lo0: flags=8049 metric 0 mtu 16384 options=600003
inet6 ::1 prefixlen 128
inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1
inet 127.0.0.1 netmask 0xff000000
nd6 options=21
groups: lo
epair0b: flags=8843 metric 0 mtu 1500
options=8
ether 08:00:27:56:59:74
hwaddr 02:21:d0:00:06:0b
inet 192.168.1.37 netmask 0xffffff00 broadcast 192.168.1.255
nd6 options=1
media: Ethernet 10Gbase-T (10Gbase-T )
status: active
groups: epair
root@jail01:~ #

===============

root@jail01:~ # cat /etc/resolv.conf

1. Generated by resolvconfsearch local home
   nameserver 192.168.1.1

==================

root@jail01:~ # cat /etc/rc.conf
ifconfig_epair0b="DHCP"
hostname="jail01"
cron_flags="$cron_flags -J 15"

1. Disable Sendmail by default
   sendmail_enable="NO"
   sendmail_submit_enable="NO"
   sendmail_outbound_enable="NO"
   sendmail_msp_queue_enable="NO"

1. Run secure syslog
   syslogd_flags="-c -ss"

1. Enable IPv6
   ipv6_activate_all_interfaces="YES"
   root@jail01:~ #

============

root@jail01:~ # netstat -rn
Routing tables
Internet:
Destination Gateway Flags Netif Expire
default 192.168.1.1 UGS epair0b
127.0.0.1 link#1 UH lo0
192.168.1.0/24 link#2 U epair0b
192.168.1.37 link#2 UHS lo0

Internet6:
Destination Gateway Flags NetifExpire
::/96 ::1 UGRS lo0
::1 link#1 UH lo0
::ffff:0.0.0.0/96 ::1 UGRS lo0
fe80::/10 ::1 UGRS lo0
fe80::%lo0/64 link#1 U lo0
fe80::1%lo0 link#1 UHS lo0
ff02::/16 ::1 UGRS lo0
root@jail01:~ #

Could you give a hand with this please?
Thanks,
Giuliano.