Date: Thu, 18 Dec 2014 10:18:19 +0400 From: Alexander Lunev <sol289@gmail.com> To: Allan Jude <allanjude@freebsd.org> Cc: freebsd-jail@freebsd.org Subject: Re: only lo0 interface inside jail, no default gw Message-ID: <CABk4_A5_=1%2BVNb-xvOx%2BfaJwrA8VrhjUPhQKnK5FGM7FxY1Oaw@mail.gmail.com> In-Reply-To: <5491ED4F.4040002@freebsd.org> References: <CABk4_A61y1m8hXXkOPEKSbzf74j64MNtYhfV59enVuJfPwQApQ@mail.gmail.com> <0096d1968fd2758df224a9dea6934ddb@gritton.org> <5491ED4F.4040002@freebsd.org>
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As i said in message to Jamie Gritton, i found why jails couldn't ping
internet - i forget to add jail's address to table which permitted to NAT.
Why subnet mask should be /32? What harm could be done if subnet mask of an
alias is the same as for the other address of that interface?
On Wed, Dec 17, 2014 at 11:53 PM, Allan Jude <allanjude@freebsd.org> wrote:
>
> On 2014-12-17 15:48, James Gritton wrote:
> > On 2014-12-16 10:35, Alexander Lunev wrote:
> >> Hello everyone.
> >>
> >> I'm trying to build jail environment on a new server with 10.1-R. I've
> >> did
> >> that before on 9.2-R, but now i'm stuck with strange network problem: no
> >> matter how i configure jail (old way through rc.conf jail_* variables or
> >> via /etc/jail.conf), i don't see default gateway in jail's routing
> table.
> >> At first i started with more complex config using separate fib for jail,
> >> but it's not working even without fibs (or in fib 0). So, here's what i
> >> have in the host system:
> >>
> >> # netstat -rn
> >> Routing tables
> >>
> >> Internet:
> >> Destination Gateway Flags Netif Expire
> >> default 10.1.1.1 UGS em0.4
> >> 10.1.1.0/24 link#4 U em0.4
> >> 10.1.1.205 link#4 UHS lo0
> >> 10.1.1.206 link#4 UHS lo0
> >> 127.0.0.1 link#3 UH lo0
> >> 127.0.0.2 link#3 UH lo0
> >>
> >> # ifconfig
> >> em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu
> 1500
> >>
> >>
> options=4219b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,WOL_MAGIC,VLAN_HWTSO>
> >>
> >> ether 00:30:48:c1:e1:b4
> >> 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 127.0.0.2 netmask 0xff000000
> >> nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
> >> em0.4: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu
> >> 1500
> >> options=103<RXCSUM,TXCSUM,TSO4>
> >> ether 00:30:48:c1:e1:b4
> >> inet 10.1.1.205 netmask 0xffffff00 broadcast 10.1.1.255
> >> inet 10.1.1.206 netmask 0xffffff00 broadcast 10.1.1.255
> >> nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
> >> media: Ethernet autoselect (1000baseT <full-duplex>)
> >> status: active
> >> vlan: 4 parent interface: em0
> >>
> >> I can ping internet from a host via gateway 10.1.1.1
> >>
> >> And here's what i have in jail:
> >>
> >> ====== BOF /etc/jail.conf =========
> >> exec.start = "/bin/sh /etc/rc";
> >> exec.stop = "/bin/sh /etc/rc.shutdown";
> >> mount.devfs;
> >> allow.raw_sockets;
> >> path = "/usr/jails/$name";
> >>
> >> template {
> >> jid = 1;
> >> ip4.addr = "em0.4|10.1.1.206/24";
> >> ip4.addr += "lo0|127.0.0.2/8";
> >> host.hostname = template;
> >> }
> >> ====== EOF /etc/jail.conf =========
> >>
> >> # jexec 1 netstat -rn
> >> Routing tables
> >>
> >> Internet:
> >> Destination Gateway Flags Netif Expire
> >> 10.1.1.206 link#4 UHS lo0
> >> 127.0.0.2 link#3 UH lo0
> >>
> >> I can ping gateway from jail
> >>
> >> # jexec 1 ping 10.1.1.1
> >> PING 10.1.1.1 (10.1.1.1): 56 data bytes
> >> 64 bytes from 10.1.1.1: icmp_seq=0 ttl=64 time=0.366 ms
> >> ^C
> >>
> >> But not the Internet or anything via routing.
> >>
> >> I have no default gateway in jail - why? What have i missed in this new
> >> jail implementation since 9.2-R?
> >
> > The netstat output is no surprise. I don't know if it was before or
> > after 9.2, but jails don't see routes that don't involve their own IP
> > addresses, and that includes the default route.
> >
> > But that doesn't mean the default route isn't there. I have netstat
> > output similar to yours, but packets still route as expected. I don't
> > see anything in your jail.conf that looks wrong, so I'm afraid I can't
> > say anything more than "it looks like it *should* work."
> >
> > - Jamie
> >
> > _______________________________________________
> > freebsd-jail@freebsd.org mailing list
> > http://lists.freebsd.org/mailman/listinfo/freebsd-jail
> > To unsubscribe, send any mail to "freebsd-jail-unsubscribe@freebsd.org"
>
> The subnet mask of an alias should always be /32, not the actual subnet
> mask
>
> Try that change in jail.conf, it should sort the issue.
>
> --
> Allan Jude
>
>
--
your sweet isn't ready yet
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