Date: Tue, 8 Jan 2013 20:35:55 +0200 From: Sami Halabi <sodynet1@gmail.com> To: Julian Elischer <julian@freebsd.org> Cc: freebsd-ipfw <freebsd-ipfw@freebsd.org> Subject: Re: firewall rules for core router Message-ID: <CAEW%2BogZbouk8mXghMwbBncb8B6QTietowzPPkF8uEUbWo40n4w@mail.gmail.com> In-Reply-To: <50EC5105.8050007@freebsd.org> References: <CAEW%2BogaCS9XuLOM9ZonnMkR-JyJckicY=xKX1y8drFKHn3UTbA@mail.gmail.com> <50EC5105.8050007@freebsd.org>
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Thank you for your response. about fwd: w.x.y.z is a router.. do i still need something? will it forward the packet correctly? =D7=91=D7=AA=D7=90=D7=A8=D7=99=D7=9A 8 =D7=91=D7=99=D7=A0=D7=95 2013 19:02,= =D7=9E=D7=90=D7=AA "Julian Elischer" <julian@freebsd.org>: > On 1/8/13 6:44 AM, Sami Halabi wrote: > >> Anh one? >> =D7=91=D7=AA=D7=90=D7=A8=D7=99=D7=9A 7 =D7=91=D7=99=D7=A0=D7=95 2013 18:= 09, =D7=9E=D7=90=D7=AA "Sami Halabi" <sodynet1@gmail.com>: >> >> Hi, >>> i have a core router that i want to enable firewall on it. >>> is these enough for a start: >>> >>> ipfw add 100 allow all from any to any via lo0 >>> ipfw add 25000 allow all from me to any >>> ipfw add 25100 allow ip from "table(7)" to me dst-port 179 >>> #ipfw add 25150 allow ip from "table(7)" to me >>> ipfw add 25200 allow ip from "table(8)" to me dst-port 161 >>> #ipfw add 25250 allow ip from "table(8)" to me >>> ipfw add 25300 allow all from any to me dst-port 22 >>> ipfw add 25400 allow icmp from any to any >>> ipfw add 25500 deny all from any to me >>> ipfw add 230000 allow all from any to any >>> >>> while table-7 are my BGP peers, table-8 my NMS. >>> >>> do i need to open anything more? any routing protocol/forwarding plan >>> issues? >>> >> I see nothing wrong.. it'll do what you want it that's what you want :-) > > you trust yourself > and you allow ssh and BGP and NMS incoming > and icmp everywhere > but you won't be able to start outgoing ssh sessions because the return > packets will be coming back to ephemeral ports. > > several ways to get around htat , like using keep-state, or just blocking > INIT packets differently (see "established") > > >>> >>> another thing: >>> i plan to add the following rule >>> ipfw add 26000 fwd w.x.y.z all from a.b.c.0/24 to any >>> >>> will this work?, does my peer (ISP, with Cisco/Juniper equipment) needs >>> to >>> do anything else? >>> >> > w.x.y.z needs to know to accept those packets as they will still be aimed > at w.x.y.z. (dest addr) > if this machine is w.x.y.z then this command will achieve that. > otherwise you will need to either have a 'fwd' rule on w.x.y.z. (if it's > freebsd) or to change the packet, > which will require you run it through natd. (or use a nat rule) > > > Thanks in advance, >>> >>> -- >>> Sami Halabi >>> Information Systems Engineer >>> NMS Projects Expert >>> FreeBSD SysAdmin Expert >>> >>> ______________________________**_________________ >> freebsd-ipfw@freebsd.org mailing list >> http://lists.freebsd.org/**mailman/listinfo/freebsd-ipfw<http://lists.fr= eebsd.org/mailman/listinfo/freebsd-ipfw> >> To unsubscribe, send any mail to "freebsd-ipfw-unsubscribe@**freebsd.org= <freebsd-ipfw-unsubscribe@freebsd.org> >> " >> >> >> >
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