Date: Tue, 30 Sep 2003 06:35:04 -0000 From: Stephen Hilton <nospam@hiltonbsd.com> To: echelon <e_chelon@yahoo.com> Cc: freebsd-stable@freebsd.org Subject: Re: IPFILTER_DEFAULT_BLOCK & No route to host Message-ID: <20030930013500.282c93be.nospam@hiltonbsd.com> In-Reply-To: <20030930032735.73176.qmail@web41204.mail.yahoo.com> References: <20030930032735.73176.qmail@web41204.mail.yahoo.com>
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On Mon, 29 Sep 2003 20:27:35 -0700 (PDT) echelon <e_chelon@yahoo.com> wrote: > Hi, > > After the option IPFILTER_DEFAULT_BLOCK is specified at kernel conf on FreeBSD 4.8 stable (cvsup'd > with tag RELENG_4_8), the machine cannot be ping'd by others on the same network. > > In addition, the machine cannot ping itself. > > ping localhost (or 127.0.0.1) -> no route to host > ping itself with its own ip address -> no route to host > > The freebsd box, with an external pppoe connection, is configured as a gateway with nat. > Interestingly, all machines on the lan can access the internet via the freebsd box normally even > though the freebsd box cannot be ping'd from these machines. > > The routing table is fine. All these problems go away if I remove the option > IPFILTER_DEFAULT_BLOCK from the kernel conf. I make clean before buildworld/kernel. > You need to create and load an ipfilter rule set. For a start create /etc/ipf.rules containing: pass in on lo0 all pass out on lo0 all pass in on xl0 all pass out on xl0 all # * xl0 should be changed to your ethernet interface type. Then in your /etc/rc.conf ipfilter_enable="YES" # Set to YES to enable ipfilter functionality ipfilter_program="/sbin/ipf" # where the ipfilter program lives ipfilter_rules="/etc/ipf.rules" # rules definition file for ipfilter. ipfilter_flags="-F a -f /etc/ipf.rules" # additional flags for ipfilter This should get you started, good luck. P.S. Cross posting is not usually a good idea, freebsd-questions is the right place for stuff like this. Cheers, Stephen Hilton nospam@hiltonbsd.com
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