Date: Sun, 28 Dec 2003 16:34:50 -0000 From: "Drew Robertson" <the_brothel@hotmail.com> To: freebsd-questions@freebsd.org Subject: Re: IPFW Rule set question... Message-ID: <BAY99-F7UVBrGI5fV1B00025543@hotmail.com>
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Thanks for your reply. I don't understand what you mean when you say NAT modifications... meaning how the packets are changed on the gateway to allow them to be seen as transparent from behind?? When I do a netstat -an while connected remotley it shows the connection on SSH as coming from 203.10.10.38, but when I add a rule to allow everything from that net it still won't allow access... I did add the rule before the divert, but i still couldn't connect until i added an allow all manually... i also tried opening up the ssh port to everyone, with allow tcp from any to me 22 via tl0, but that wouldn't allow a connection either... It's a bit confusing... Thanks again, D >From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org> >Reply-To: freebsd-questions@freebsd.org >To: "Drew Robertson" <the_brothel@hotmail.com> >CC: freebsd-questions@freebsd.org >Subject: Re: IPFW Rule set question... >Date: 24 Dec 2003 16:43:49 -0500 > >"Drew Robertson" <the_brothel@hotmail.com> writes: > > > I have enabled SSH, TELNET and FTP on my freeBSD 4.8 box at home... it > > is dual homed, 2 NICs one for the internal LAN one running my cable > > modem. Everything works fine on the internal side. > > > > When accessing the box using any of those apps from work, the system > > looks to briefly connect and then returns a "Connection Lost" or > > "Connection closed by remote host error". > > > > The command setup to allow in access is as follows... > > > > 820 allow log tcp from any to me 22 limit src-addr 4 in recv tl0 setup > > 830 allow log tcp from any to me 23 limit src-addr 4 in recv tl0 setup > >I assume these are supposed to have "keep-state" in them. >It *is* written that way in the full ruleset you posted lower down. > > > when this didn't work I added another command at the start of the > > ruleset to just let everything in from a particular IP address range... > > > > 202 allow ip from 203.10.10.0/24 to any > > > > however this produced the same error... > > > > It wasn't until I allowed all from any to any that I was able to >connect... > >Then the packets aren't actually being seen as coming from that >address. Maybe you're running into NAT modifications? > > > When checking out the security log, it tells me that rule 820 is > > allowing access to my computer at home... > >But only for SYN packets... > > >-- >Lowell Gilbert, embedded/networking software engineer, Boston area: > resume/CV at http://be-well.ilk.org:8088/~lowell/resume/ > username/password "public" _________________________________________________________________ Hot chart ringtones and polyphonics. Go to http://ninemsn.com.au/mobilemania/default.asp
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