Date: Tue, 05 Mar 2013 18:42:02 +0100 From: Matthias Petermann <matthias@d2ux.org> To: "questions@freebsd.org" <questions@freebsd.org> Subject: Jailed process listening to broadcast address of host system - possible? Message-ID: <20130305184202.Horde.eDUXhBWXINRGxbZx4ZcRCQ2@d2ux.org>
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Hello,
is there any way to listen to a networks broadcast adress from within a Jail?
Given ist the following setup:
* The host (IP 192.168.2.127)
* The jail (same IP as host, 192.168.2.127)
When I do:
$ nc -l 192.168.2.255 9999
I got the following results:
root@host # nc -l 192.168.2.255 9999
<Listening for connections, ok>
root@jail # nc -l 192.168.2.255 9999
nc: Can't assign requested address
The latter is the problem. I already sat security.jail.allow_raw_sockets=1
and now not sure if I am trying to do something which is not allowed
by design?
Thanks in advance,
Matthias
# Additional Information:
## ifconfig (host):
root@host # ifconfig -a
em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=9b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM>
ether 08:00:27:b3:64:f2
inet 192.168.2.127 netmask 0xffffff00 broadcast 192.168.2.255
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
media: Ethernet autoselect (1000baseT <full-duplex>)
status: active
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
options=600003<RXCSUM,TXCSUM,RXCSUM_IPV6,TXCSUM_IPV6>
inet6 ::1 prefixlen 128
inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3
inet 127.0.0.1 netmask 0xff000000
inet 10.0.0.1 netmask 0xffffffff
inet 10.0.0.2 netmask 0xffffffff
inet 10.0.0.3 netmask 0xffffffff
inet 10.0.0.4 netmask 0xffffffff
inet 10.0.0.5 netmask 0xffffffff
nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
pflog0: flags=141<UP,RUNNING,PROMISC> metric 0 mtu 33152
nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
## ifconfig (jail):
root@jail # ifconfig -a
em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=9b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM>
ether 08:00:27:b3:64:f2
inet 192.168.2.127 netmask 0xffffff00 broadcast 192.168.2.255
media: Ethernet autoselect (1000baseT <full-duplex>)
status: active
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
options=600003<RXCSUM,TXCSUM,RXCSUM_IPV6,TXCSUM_IPV6>
pflog0: flags=141<UP,RUNNING,PROMISC> metric 0 mtu 33152
--
Matthias Petermann <matthias@d2ux.org>
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