Date: Mon, 22 Dec 2014 13:20:36 -0700 (MST) From: Warren Block <wblock@wonkity.com> To: Mark Felder <feld@FreeBSD.org> Cc: freebsd-jail@freebsd.org Subject: Re: only lo0 interface inside jail, no default gw Message-ID: <alpine.BSF.2.11.1412221319160.90591@wonkity.com> In-Reply-To: <1419257122.839910.205722545.5A95A973@webmail.messagingengine.com> References: <CABk4_A61y1m8hXXkOPEKSbzf74j64MNtYhfV59enVuJfPwQApQ@mail.gmail.com> <0096d1968fd2758df224a9dea6934ddb@gritton.org> <5491ED4F.4040002@freebsd.org> <CABk4_A5_=1%2BVNb-xvOx%2BfaJwrA8VrhjUPhQKnK5FGM7FxY1Oaw@mail.gmail.com> <1419257122.839910.205722545.5A95A973@webmail.messagingengine.com>
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On Mon, 22 Dec 2014, Mark Felder wrote: > > > On Thu, Dec 18, 2014, at 00:18, Alexander Lunev wrote: >> 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? >> > > That's just the way the network stack has always worked; weird things > happen if you use the wrong subnet mask on the aliases. IPv4 aliases are > /32 and IPv6 aliases are /128. As documented in the man page for > ifconfig: > > Usually 0xffffffff is most appropriate. At one time, only /32 would work. Didn't that change a few releases ago, so non-/32 netmasks could be used on aliases?
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