# # (SCO Unix) Can OSR5 do NAT or IP filtering (function as a firewall)?
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© December 2003 (various)

This article is from a FAQ concerning SCO operating systems. While some of the information may be applicable to any OS, or any Unix or Linux OS, it may be specific to SCO Xenix, Open There is lots of Linux, Mac OS X and general Unix info elsewhere on this site: Search this site is the best way to find anything.

Can SCO Unix OSR5 do NAT or ip filtering (function as a firewall)?

Yes, with "ipfilter"- it's built into 5.0.6 and is available as a supplement for 5.0.4 and 5.0.5- TLS709 ftp://stage.sco.com/TLS/. But note this Sept 14 2000 post from Kamal Mostafa:

The 'ip' driver included in TLS709 needs the routine bcmp(), which didn't appear in the kernel until 5.0.4. After I discovered this problem, I fixed the 'ip' driver so that it no longer needs bcmp(). So the latest version of the 'ip' driver (e.g. from a 5.0.6 system) will work on 5.0.x systems. Eventually, I will update TLS709 with the newer version. In the meantime, replace the /etc/conf/pack.d/ip/Driver.o that TLS709 put there with a newer version. If anyone else is getting this problem, you can either lift the 'ip' driver from a 5.0.6 system, or contact me directly and I'll email you a replacement binary as well. Kamal A. Mostafa SCO Engineering

Kamal has given me permission to put this driver on my site; you can shift-click (or "Save Link As") to download it from aplawrence.com/pub/ip-Driver.o. Copy it to /etc/conf/pack.d/ip/Driver.o and relink your kernel (make a safe copy of your ip/Driver.o first).

You'll also need netstat: aplawrence.com/pub/netstat. Copy that to /usr/bin and

chown bin:mem /usr/bin/netstat
chmod 2711 /usr/bin/netstat

Again, be sure to save a copy of your original netstat!

See also IPFILTER firewalls for OSR5 /Security/ipfilter.html and http://www.pcunix.com/Security/firewallserver.html

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