Date: Tue, 08 Jan 2013 11:11:36 -0800 From: Julian Elischer <julian@freebsd.org> To: Sami Halabi <sodynet1@gmail.com> Cc: freebsd-ipfw <freebsd-ipfw@freebsd.org> Subject: Re: firewall rules for core router Message-ID: <50EC6F68.6080202@freebsd.org> In-Reply-To: <CAEW%2BogZbouk8mXghMwbBncb8B6QTietowzPPkF8uEUbWo40n4w@mail.gmail.com> References: <CAEW%2BogaCS9XuLOM9ZonnMkR-JyJckicY=xKX1y8drFKHn3UTbA@mail.gmail.com> <50EC5105.8050007@freebsd.org> <CAEW%2BogZbouk8mXghMwbBncb8B6QTietowzPPkF8uEUbWo40n4w@mail.gmail.com>
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On 1/8/13 10:35 AM, Sami Halabi wrote: > > 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? > It will send them to where-ever it thinks they were originally sent to. > בתאריך 8 בינו 2013 19:02, מאת "Julian Elischer" <julian@freebsd.org > <mailto:julian@freebsd.org>>: > > On 1/8/13 6:44 AM, Sami Halabi wrote: > > Anh one? > בתאריך 7 בינו 2013 <tel:2013> 18:09, מאת "Sami Halabi" > <sodynet1@gmail.com <mailto: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 <mailto:freebsd-ipfw@freebsd.org> > mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-ipfw > To unsubscribe, send any mail to > "freebsd-ipfw-unsubscribe@freebsd.org > <mailto:freebsd-ipfw-unsubscribe@freebsd.org>" > > >
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