Date: Tue, 12 Apr 2005 11:33:59 +0200 From: Clement Twine <clem.twain@gmail.com> To: Robert Slade <bsd@bathnetworks.com> Cc: "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org> Subject: Re: weird problem with ipfw and ftp Message-ID: <425B9607.3090504@gmail.com> In-Reply-To: <1113296462.24798.13.camel@lmail.bathnetworks.co.uk> References: <425B7342.2080307@gmail.com> <1113291668.24798.3.camel@lmail.bathnetworks.co.uk> <425B7FBA.1050000@gmail.com> <1113296462.24798.13.camel@lmail.bathnetworks.co.uk>
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hi Robert, Robert Slade wrote: > On Tue, 2005-04-12 at 08:58, Clement Twine wrote: > >>>>i have a problem with users accessing my ftp service from the >>>>internet. everything was working well until i changed from >>>>Linux/shorewall to freebsd/ipfw as my firewall. >>>> >>>>my setup is briefly as follows: >>>> >>>>FTP_Server (10.0.0.1) --- Firewall (IPFW) ----- INTERNET >>>> >>>>The linux rules were just two (and were working): >>>> >>>> allow tcp from any to 10.0.0.1 21 >>>> allow tcp from 10.0.0.1 21 to any >>>> >>>>I have the following in ipfw but they have refused to work! >>>> >>>> ipfw add 00010 allow tcp from any to 10.0.0.1 21 >>>> ipfw add 00011 allow tcp from 10.0.0.1 21 to any >>>> >>>>The problem is that an ftp session is established, but when the >>>>session enters passive mode, the ftp session hangs. Are there any >>>>other ports that need to be opened? Has anyone had such a problem >>>>before? I can see in the logs that unprivileged ports are >>>>responding from the ftp server to the requestor - but have tried >>>>all combinations of rules to no avail! >>> >>>You need to use port 20 too. Additionally, passive ftp uses high number >>>ports to actually transfer the data. I am not sure how to do this with >>>IPFW but there are are a number of tutorials about this try google. >> >>I have failed to get nothing from google - its seems everyone has >>tried series of combinations! >> >>Anyway, here is my rules: >> >>ipfw add 00115 pass log tcp from any 1024-65535 to 10.0.0.1 >>49152-65535 >>ipfw add 00116 pass log tcp from any to 10.0.0.1 21 in recv sis1 >>setup keep-state >>ipfw add 00117 pass log tcp from any to 10.0.0.1 20 in recv sis1 >>setup keep-state >> >>but this hasnt helped much. have been trying for days! does >>anyone have rules that are working - you can give 'em to me - or >>advise where the above rules need tweaking. > > This may help: > > http://www.theserverpages.com/20103/13/ thanks - it helped indeed :-) All i needed to do was to define a range of passive ports in the ftp config and specify these ports in the ipfw rules - thanks! but i wonder why i did not have to do this with exactly the same setup when i was using shorewall! ta, clem.
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