Date: Tue, 8 Jan 2013 21:22:53 +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%2BogbNoDp_jsaGmTYo4e1cEffenOzpTqpO8pXKcLLKN1VngQ@mail.gmail.com> In-Reply-To: <50EC6F68.6080202@freebsd.org> References: <CAEW%2BogaCS9XuLOM9ZonnMkR-JyJckicY=xKX1y8drFKHn3UTbA@mail.gmail.com> <50EC5105.8050007@freebsd.org> <CAEW%2BogZbouk8mXghMwbBncb8B6QTietowzPPkF8uEUbWo40n4w@mail.gmail.com> <50EC6F68.6080202@freebsd.org>
next in thread | previous in thread | raw e-mail | index | archive | help
that exactly what i need, all address space in use is public Thank sgain, Sami =D7=91=D7=AA=D7=90=D7=A8=D7=99=D7=9A 8 =D7=91=D7=99=D7=A0=D7=95 2013 21:11,= =D7=9E=D7=90=D7=AA "Julian Elischer" <julian@freebsd.org>: > > 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. > > >> =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 1= 8:09, =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 >>>> To unsubscribe, send any mail to "freebsd-ipfw-unsubscribe@freebsd.org= " >>>> >>>> >>> >
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?CAEW%2BogbNoDp_jsaGmTYo4e1cEffenOzpTqpO8pXKcLLKN1VngQ>