Date: Tue, 18 Jun 2019 12:56:01 -0500 From: Karl Denninger <karl@denninger.net> To: freebsd-questions@freebsd.org Subject: Re: IPFW redirect to another port? Message-ID: <be7edcf3-2ab5-2e0c-7caa-d44cbfe9e04c@denninger.net> In-Reply-To: <20190618165028.83C662015F9118@ary.qy> References: <20190618165028.83C662015F9118@ary.qy>
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This is a cryptographically signed message in MIME format. --------------ms070105020402020603050607 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable On 6/18/2019 11:50 AM, John Levine wrote: > I would like to use ipfw to redirect incoming port 53 requests from a > few IP addresses to a different port, so I can use a custom DNS server > to answer them. I can figure out how to redirect their traffic to, > say, port 5553, but the responses come from 5553 which of course > doesn't work. > > Any suggestions about how to adjust the port numbers going both ways? = It's > fine if they screw up other traffic to those IPs. TIA. The easiest way to do this is likely with an in-kernel NAT entry with a=20 "redirect_port" stanza; that will "twist" packets going in both=20 directions.=C2=A0 The most-common use for this is to take something on th= e=20 external interface (e.g. 1.2.3.4:8080) and direct it at an internal host = on port 80 (e.g. 10.1.1.1:80); the "redirect_port" stanza allows for=20 both TCP and UDP redirection with both sides being translated. --=20 -- Karl Denninger /The Market-Ticker/ S/MIME Email accepted and preferred --------------ms070105020402020603050607 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgMFADCABgkqhkiG9w0BBwEAAKCC DdgwggagMIIEiKADAgECAhMA5EiKghDOXrvfxYxjITXYDdhIMA0GCSqGSIb3DQEBCwUAMIGL MQswCQYDVQQGEwJVUzEQMA4GA1UECAwHRmxvcmlkYTESMBAGA1UEBwwJTmljZXZpbGxlMRkw 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