Date: Wed, 14 Oct 2020 15:51:57 +0200 From: Arsenij Solovjev <xeper000@gmail.com> To: Kristof Provost <kp@freebsd.org> Cc: freebsd-jail@freebsd.org Subject: Re: vnet Jail on a non-dedicated network interface Message-ID: <CA%2BRQ_FfvOCk0QEqNMHgaJ4qAE3G2L3c3p%2BH4gDg1rLyC5L-h5A@mail.gmail.com> In-Reply-To: <CCF31BD6-2335-4C5D-A230-9AA871466AD3@FreeBSD.org> References: <CA%2BRQ_Fd7Z7ynky8iB5h=cV30oRk5mPw0Out-2c=RF_e-AZVo2A@mail.gmail.com> <3F8DAE0C-0EA1-40C5-9825-262F547E1954@FreeBSD.org> <CA%2BRQ_Fc9HJhuJQe4wxpePe67R%2Be1XcCDBt9HjVHZA7RQfsOHzg@mail.gmail.com> <CCF31BD6-2335-4C5D-A230-9AA871466AD3@FreeBSD.org>
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On Wed, 14 Oct 2020 at 15:41, Kristof Provost <kp@freebsd.org> wrote: > On 14 Oct 2020, at 15:36, Arsenij Solovjev wrote: > > On Wed, 14 Oct 2020 at 14:42, Kristof Provost <kp@freebsd.org> wrote: > > > >> On 14 Oct 2020, at 14:18, Arsenij Solovjev wrote: > >>> Hi all! > >>> Does anybody know if it's possible to run a vnet jail on a > >>> non-dedicated > >>> interface? I have the Lucas book on jails. In it he says that for > >>> vnet > >>> you > >>> need to pick a dedicated interface, remove all networking IP > >>> configuration > >>> and only bring it up. Afterwards you set up jib and whatnot. > >>> > >>> All works well if I use a dedicated secondary interface (let's call > >>> it > >>> em1). If I use em0 however I cannot ping the jail. > >>> > >>> I would like to have a host with that has a single network interface > >>> which > >>> is used for both normal networking stuff as well as having the vnet > >>> jail > >>> run on it. > >>> > >>> Maybe I could create some sort of virtual interface and run vnet on > >>> it? > >>> > >>> Any ideas here? Thanks in advance! > >>> > >> Look at epair interfaces. > >> > >> You can put em0 and epair0a in a bridge together and add epair0b to > >> the > >> vnet jail. > >> That gets the vnet jail connected to your LAN. > >> > >> Or you can skip the bridge, assign an IP to epair0a and route between > >> the jail and your LAN. > >> > >> Regards, > >> Kristof > >> > > > > Hi Kristof, > > > > Thanks for your reply! > > > > considering your first idea. I did this, the jail gets created > > seemingly > > fine. However I cannot ping the ip of epair0b (this works when using a > > dedicated interface). > > Also I cannot reach my gateway from within the jail. This too works > > when > > using a dedicated interface. > > Btw I have "sysctl security.jail.allow_raw_sockets=1". > > Here is my host ifconfig when putting em0 and epair0a in a bridge: > > > > em0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric > > 0 > >> mtu 1500 > >> > > > options=812099<RXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,WOL_MAGIC,VLAN_HWFILTER> > > > > ether 9a:4c:eb:b5:95:bf > > > > inet 172.18.20.145 netmask 0xffffff00 broadcast 172.18.20.255 > > > > media: Ethernet autoselect (1000baseT <full-duplex>) > > > > status: active > > > > nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL> > > > > jailether: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 > > mtu > >> 1500 > >> > > > options=81209b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,WOL_MAGIC,VLAN_HWFILTER> > > > > ether 56:39:b7:c5:2e:ec > > > > media: Ethernet autoselect (1000baseT <full-duplex>) > > > > status: active > > > > nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL> > > > > lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384 > >> > > options=680003<RXCSUM,TXCSUM,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6> > > > > inet6 ::1 prefixlen 128 > > > > inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3 > > > > inet 127.0.0.1 netmask 0xff000000 > > > > inet 10.43.84.1 netmask 0xffffff00 > > > > groups: lo > > > > nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL> > > > > em0bridge: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 > > mtu > >> 1500 > >> > > ether 02:13:0b:48:53:00 > > > > id 00:00:00:00:00:00 priority 32768 hellotime 2 fwddelay 15 > > > > maxage 20 holdcnt 6 proto rstp maxaddr 2000 timeout 1200 > > > > root id 00:00:00:00:00:00 priority 32768 ifcost 0 port 0 > > > > member: e0a_sambaad flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP> > > > > ifmaxaddr 0 port 5 priority 128 path cost 2000 > > > > member: em0 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP> > > > > ifmaxaddr 0 port 1 priority 128 path cost 20000 > > > > groups: bridge > > > > nd6 options=1<PERFORMNUD> > > > > e0a_sambaad: > > flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> > >> metric 0 mtu 1500 > >> > > options=8<VLAN_MTU> > > > > ether 02:a4:c4:b5:95:bf > > > > hwaddr 02:78:fd:34:e8:0a > > > > groups: epair > > > > media: Ethernet 10Gbase-T (10Gbase-T <full-duplex>) > > > > status: active > > > > nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL> > > > > > > > > Here's the ifconfig from my within my jail: > > > > lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384 > >> > > options=680003<RXCSUM,TXCSUM,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6> > > > > inet6 ::1 prefixlen 128 > > > > inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1 > > > > inet 127.0.0.1 netmask 0xff000000 > > > > groups: lo > > > > nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL> > > > > e0b_sambaad: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric > > 0 > >> mtu 1500 > >> > > options=8<VLAN_MTU> > > > > ether 0e:a4:c4:b5:95:bf > > hwaddr 02:78:fd:34:e8:0b > > > This is odd. Are you assigning a new MAC address to the epair interfaces > somewhere? Both ends of the epair seem to have a new MAC address, and > the same one at that. > > Regards, > Kristof > Not explicitly, no, I let the jib script do the epair creation.
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