IPFW Rule set question...

[Lowell Gilbert]

"Drew Robertson" <the_brothel at 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/
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