Date: Thu, 2 Feb 2023 16:19:57 +0530 From: Sambuddho Chakravarty <sambuddho@iiitd.ac.in> To: freebsd-security@freebsd.org Subject: Re: help regarding IP address spoofing (when using nmap) Message-ID: <CAK1-MKcNetGHrg5VpHpmrE%2BXDf%2BSvn1pp-rWd%2BTzU9ay76frfw@mail.gmail.com>
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--0000000000000384a005f3b55664 Content-Type: text/plain; charset="UTF-8" Hi All I am a relatively newbie to FreeBSD (earlier was running Linux). I am running FreeBSD 13.1. I am trying to run nmap with source IP address spoofing (for some academic purposes). It works fine with Linux but on FreeBSD I get the following error: # nmap -e re0 -S 192.168.17.92 -sS 143.110.249.18 -p 8080 -Pn Starting Nmap 7.93 ( https://nmap.org ) at 2023-02-02 16:04 IST NSOCK ERROR [0.0170s] mksock_bind_addr(): Bind to 192.168.17.92:0 failed (IOD #1): Can't assign requested address (49) NSOCK ERROR [0.0170s] mksock_bind_addr(): Bind to 192.168.17.92:0 failed (IOD #2): Can't assign requested address (49) It works fine without the source spoofing but doesn't when I use it. I can however use my own machine's source IP address with the '-S' option. -- best, sambuddho --0000000000000384a005f3b55664 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:monospac= e">Hi All</div><div class=3D"gmail_default" style=3D"font-family:monospace"= >=C2=A0I am a relatively newbie to FreeBSD (earlier was running</div><div c= lass=3D"gmail_default" style=3D"font-family:monospace">Linux). I am running= FreeBSD 13.1.=C2=A0</div><div class=3D"gmail_default" style=3D"font-family= :monospace"><br></div><div class=3D"gmail_default" style=3D"font-family:mon= ospace">I am trying to run nmap with source IP address spoofing=C2=A0</div>= <div class=3D"gmail_default" style=3D"font-family:monospace">(for some acad= emic purposes). It works fine with Linux=C2=A0</div><div class=3D"gmail_def= ault" style=3D"font-family:monospace">but on FreeBSD I get the following er= ror:</div><div class=3D"gmail_default" style=3D"font-family:monospace"><br>= </div><div class=3D"gmail_default" style=3D"font-family:monospace">#=C2=A0n= map -e re0 -S 192.168.17.92 -sS 143.110.249.18=C2=A0 -p 8080 -Pn</div><div = class=3D"gmail_default" style=3D"font-family:monospace">Starting Nmap 7.93 = ( <a href=3D"https://nmap.org">https://nmap.org</a>; ) at 2023-02-02 16:04 I= ST<br>NSOCK ERROR [0.0170s] mksock_bind_addr(): Bind to <a href=3D"http://1= 92.168.17.92:0">192.168.17.92:0</a> failed (IOD #1): Can't assign reque= sted address (49)<br>NSOCK ERROR [0.0170s] mksock_bind_addr(): Bind to <a h= ref=3D"http://192.168.17.92:0">192.168.17.92:0</a>; failed (IOD #2): Can'= ;t assign requested address (49)<br></div><div><br></div><div><br></div><di= v><div class=3D"gmail_default" style=3D"font-family:monospace">It works fin= e without the source spoofing but doesn't when I use</div><div class=3D= "gmail_default" style=3D"font-family:monospace">it. I can however use my ow= n machine's source IP address with</div><div class=3D"gmail_default" st= yle=3D"font-family:monospace">the '-S' option.</div><br></div>-- <b= r><div dir=3D"ltr" class=3D"gmail_signature" data-smartmail=3D"gmail_signat= ure"><div dir=3D"ltr"><font face=3D"monospace">best,</font><div><font face= =3D"monospace"></font></div><div><font face=3D"monospace">sambuddho <br></f= ont></div></div></div></div> --0000000000000384a005f3b55664--
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