Date: Wed, 9 Oct 2019 14:57:28 -0500 From: Matthew Grooms <mgrooms@shrew.net> To: freebsd-net@freebsd.org Subject: Re: CARP and NAT question Message-ID: <a4fa906a-4a9f-3267-3cb0-70a1692b73f2@shrew.net> In-Reply-To: <2591c7ce-887e-0e38-bb69-01c1e0ba5bd4@freebsd.org> References: <20191008134851.GP2691@home.lan> <a0a3a5c2-1300-b90b-3114-ae80adcf7f4d@shrew.net> <20191008155813.GS2691@home.lan> <b182358f-8ec0-4a71-b201-1736282d847d@freebsd.org> <20191009093454.GU2691@home.lan> <2591c7ce-887e-0e38-bb69-01c1e0ba5bd4@freebsd.org>
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On 10/9/2019 2:50 PM, Julian Elischer wrote: > On 10/9/19 2:34 AM, Julien Cigar wrote: >> On Tue, Oct 08, 2019 at 01:05:37PM -0700, Julian Elischer wrote: >>> On 10/8/19 8:58 AM, Julien Cigar wrote: >>>> On Tue, Oct 08, 2019 at 10:20:34AM -0500, Matthew Grooms wrote: >>>>> Hi Julien, >>>> Hi Matthew, >>>> >>>>> It's not clear why you are trying to assign multiple carp IP >>>>> address to >>>>> two different interfaces from within the same IP subnet. Are you >>>>> trying >>>>> to fail over a 2nd carp address or are you trying to improve >>>>> throughput/redundancy? If you just want to fail over a 2nd carp >>>>> address, >>>>> assign a 2nd alias to your first interface. If your trying to improve >>>>> throughput/redundancy, assign both interfaces to a lagg and build >>>>> your >>>>> carp interfaces on top of that instead. >>>>> >>>> Currently outbound traffic from $net1 and $net2 (two private networks) >>>> pass through the same network interface (igb0) (as you can see in (1) >>>> in my previous post) on the router. I'd like to prevent that >>>> $net2 saturates the interface and slow down traffic from $net1 >>>> (which is >>>> more important). I could lagg and build CARP on top of that but it >>>> wouldn't prevent $net2 to saturate the interface (unless I'm plugin >>>> ALTQ >>>> of course, which I'd like to avoid). >>>> >>>>> -Matthew >>>>> >>>>> On 10/8/2019 8:48 AM, Julien Cigar wrote: >>>>>> Hello, >>>>>> >>>>>> I'd like to NAT outbound traffic from two different private networks >>>>>> through two different interfaces, with CARP on top. I have 4 >>>>>> public IPS >>>>>> available (193.x.x.89, 193.x.x.90, 193.x.x.91, 193.x.x.92). >>>>>> >>>>>> I have two redundant router/firewall running FreeBSD 12 with CARP >>>>>> and >>>>>> PF with the following: (1) which works well, but all traffic >>>>>> goes through the same interface. >>>>>> >>>>>> So I'd like to switch to something like (2), which will not work >>>>>> (lines >>>>>> 5 and 13 are not valid) and I'm wondering if I could use >>>>>> something like >>>>>> (3) ..? >>>>>> >>>>>> Thank you! >>>>>> Julien >>>>>> >>>>>> (1) >>>>>> https://gist.github.com/silenius/4f6173a9b6690292c2174ab3bb89d292 >>>>>> (2) >>>>>> https://gist.github.com/silenius/da9be7e74e9861fa55f927d194e3e410 >>>>>> (3) >>>>>> https://gist.github.com/silenius/b237565b0d181248ff80ea296e5537db >>>>>> >>>>> _______________________________________________ >>>>> freebsd-net@freebsd.org mailing list >>>>> https://lists.freebsd.org/mailman/listinfo/freebsd-net >>>>> To unsubscribe, send any mail to >>>>> "freebsd-net-unsubscribe@freebsd.org" >>> can you draw it? >> yes, see https://ibb.co/mv5RPM9 > > so, you have several ways of doing this: > > one is to assign a different routing table to each class of traffic. > > Each table has a different default route, sending data out to a > different external interface. > > Each interface out is NAT'd so that the return packets will come back > the same way. > How do you classify the traffic based on the source address when using multiple route tables? > But you only have a single pipe to the internet, So one wonders how > that helps with redundancy? > I asked a similar question. He believe he mentioned that he was trying to get around the 1Gbit limit of each interface. WRT redundancy, he probably means the use of a backup firewall, carp and probably pfsync. -Matthew
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