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Top Forums UNIX for Advanced & Expert Users ipf/ipnat NAT/port forward issues Post 302575347 by spakov on Monday 21st of November 2011 10:56:27 AM
Old 11-21-2011
ipf/ipnat NAT/port forward issues

I've been going crazy trying to get this working. Here's the situation: we have a Solaris 10 box that connects an internal network to an external network. We're using ipf/ipnat on it. We've added a couple of new boxes to the internal network (192.168.1.100, .101) and want to be able to get to port 80 on them from the external network (say, at ports 81 and 82). We'd also like to allow the internal boxes to get to the rest of the world using NAT. ipf/ipnat seems like it can do this.

Here's an ifconfig -a from the Solaris box:
Code:
lo0: flags=2001000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4,VIRTUAL> mtu 8232 index 1
        inet 127.0.0.1 netmask ff000000
e1000g0: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2
        inet 192.168.0.2 netmask ffffff00 broadcast 192.168.0.255
        ether 8:0:27:b6:64:40
e1000g1: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 3
        inet 192.168.1.1 netmask ffffff00 broadcast 192.168.1.255
        ether 8:0:27:24:f0:95
e1000g2: flags=1004843<UP,BROADCAST,RUNNING,MULTICAST,DHCP,IPv4> mtu 1500 index 4
        inet 10.0.4.15 netmask ffffff00 broadcast 10.0.4.255
        ether 8:0:27:90:3c:a

e1000g0 is connected to the external network. e1000g1 is connected to the internal network. e1000g2 is connected to the Internet.

I've got these rules in ipnat.conf:
Code:
map e1000g1 192.168.1.0/24 -> 0/32 portmap tcp/udp 10000:20000
map e1000g1 192.168.1.0/24 -> 0/32
rdr e1000g1 0.0.0.0/0 port 81 -> 192.168.1.100 port 80

ipf.conf is configured to allow all traffic.

Network connectivity is solid. Everything is connected the way it's supposed to be and I can get to everything from everywhere I'd expect to be able to.

Here's the problem: my maps and rdrs don't work. I can try to do something that gets me to the outside from the internal box (192.168.1.100) and I get this in ipnat -l, but the connection doesn't actually work:
Code:
List of active MAP/Redirect filters:
map e1000g1 192.168.1.0/24 -> 0.0.0.0/32 portmap tcp/udp 10000:20000
map e1000g1 192.168.1.0/24 -> 0.0.0.0/32
rdr e1000g1 192.168.0.0/24 port 81 -> 192.168.1.100 port 80 tcp

List of active sessions:
MAP 192.168.1.1     <- -> 192.168.1.1     [192.168.1.100]

If I try to get to http://192.168.0.2:81/ from the external network, though, I get no new "active sessions" entry from ipnat -l (and obviously the page doesn't load).

Any thoughts as to what I'm doing wrong here? Hopefully it's something stupid I've just overlooked. I've spent way more time on this than I'd hoped to when I started. I've tried any number of variations and have Googled extensively to no avail.

Any help is appreciated.
 

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ipnat(1M)                                                                                                                                ipnat(1M)

NAME
ipnat - user interface to the NAT subsystem SYNOPSIS
ipnat [-dlhnrsvCF] -f filename The ipnat utility opens a specified file (treating - as stdin) and parses it for a set of rules that are to be added or removed from the IP NAT. If there are no parsing problems, each rule processed by ipnat is added to the kernel's internal lists. Rules are appended to the internal lists, matching the order in which they appear when given to ipnat. ipnat's use is restricted through access to /dev/ipauth, /dev/ipl, and /dev/ipstate. The default permissions of these files require ipnat to be run as root for all operations. ipnat's use is restricted through access to /dev/ipnat. The default permissions of /dev/ipnat require ipnat to be run as root for all oper- ations. The following options are supported: -C Delete all entries in the current NAT rule listing (NAT rules). -F Delete all active entries in the current NAT translation table (currently active NAT mappings). -d Turn debug mode on. Causes a hex dump of filter rules to be generated as it processes each one. -f filename Parse specified file for rules to be added or removed from the IP NAT. filename can be stdin. -h Print number of hits for each MAP/Redirect filter. -l Show the list of current NAT table entry mappings. -n Prevents ipf from doing anything, such as making ioctl calls, which might alter the currently running kernel. -s Retrieve and display NAT statistics. -r Remove matching NAT rules rather than add them to the internal lists. -v Turn verbose mode on. Displays information relating to rule processing and active rules/table entries. /dev/ipnat Link to IP Filter pseudo device. /dev/kmem Special file that provides access to virtual address space. /etc/ipf/ipnat.conf Location of ipnat startup configuration file. /usr/share/ipfilter/examples/ Contains numerous IP Filter examples. See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWipfu | +-----------------------------+-----------------------------+ |Interface Stability |Evolving | +-----------------------------+-----------------------------+ ipf(1M), ipfstat(1M), ipnat(4), attributes(5) To view license terms, attribution, and copyright for IP Filter, the default path is /usr/lib/ipf/IPFILTER.LICENCE. If the Solaris operat- ing environment has been installed anywhere other than the default, modify the given path to access the file at the installed location. 25 Jul 2005 ipnat(1M)
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