Tips for Securing Your Home Router
Seemingly minor and easily overlooked settings can still have profound security implications. Here are some steps you can take to make sure your wired or wireless home router — and by extension, your network — is as secure as possible.
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Nexland ISB2LAN-H4 Internet Sharing Box
Author: Tim Higgins Review Date: 7/14/2000
multi-client VPN support
- Very flexible port mapping/forwarding,
including Triggered Maps!
only firmware update support
- Limited availability and support.
1 RJ45 10BaseT for the WAN
4 RJ45 10BaseT LAN (no Uplink)
printed User guide
CDROM with manual, drivers, Help files
Normal UTP cable
Reset switch (back panel)
2 DIPswitches for router administration
a difference new firmware makes!
Long-time readers may remember one of my first router reviews, the Nexland
ISB2LAN. My conclusion was that is was basically a UMAX UGate
Plus clone, but with more limited support and availability.
Well, Nexland has come a long way in the year since that review. The
company has gone through a reverse acquisition, revamped their Web site,
signed up some good partnering deals, and applied for a Patent on their
Multi-session IPSec passthrough technology. They've also done some
major work on their firmware, so that the ISB2LAN and ISB2LAN-H4 can't
really be thought of as "clones" of the UMAX products any more.
Although this review is on the ISB2LAN-H4, all the software features
that are discussed also apply to the ISB2LAN, as long as you update it
with the latest firmware (DHCPPPPOE7R1F.zip as of this date), which
you can get from this
The H4 is packaged in the same box as the 1 port model.
The Link/Activity LEDs for the four LAN ports are on the back panel of
the box, along with the RJ45 connectors. This isn't the best place
for the indicators, but at least they're there!
Setup was very easy, with the basic steps documented on a printed Quick
Start sheet. Nexland has included both normal and crossover UTP
cables so that you don't have to run out to the store to get the box installed
in pretty much any network configuration. The supplied crossover
cable also makes up for the lack of Uplink port on the built-in hub.
The H4 comes configured as a DHCP client and with its LAN DHCP server
enabled, and many users will pretty much be able to plug in and go, with
maybe a quick winipcfg release/renew for their Windows clients.
If this isn't your situation, then you'll need to dig into the setup
screens, which are located starting at 192.168.0.1. You can
get some idea of what you can do from the screen shots below.
You'll see addresses in the 192.168.1.X range in the screen shots.
This is due to my network configuration. You would see addresses in
the 192.168.0.X range with the factory default settings.
[Just click on an image to open another window with a full-sized view
of the screen.]
The H4 has a lot of configurability, but you'll have to get used to navigating
around the various screens. I found things a little confusing, mainly
due to the lack of a consistent link navigation bar on all the screens,
and the use of underlined text that is not hyperlinked. There's
also one important hidden screen, located at http://192.168.0.1/hidden.htm.
So that it doesn't remain a big secret, the screen shot below shows what
you can do there.
One more complaint on the interface and I'll move on.
Nexland: Please put the help files IN the box, not on a client machine's
disk! The present method creates unnecessary confusion and adds
a step to an otherwise smooth setup process. There are also some
linking problems in the various screens that need to be fixed, so you
might have to search in the installed ISB\HELP folder to find what you
The H4 should work for most any ISP due to its support of many login/authentication
methods and protocols:
You can name the router, and set a domain name for it.
RoadRunner TAS login protocol is supported by using a Special Applications
port mapping (follow the instructions in the printed user guide on
pages 12 & 13).
MediaOne/RoadRunner using MAC address authentication
The WAN port MAC address is plainly shown on a few screens so that
MediaOne/RR users whose service is locked to their NIC will be able
to call in the new MAC address during router installation. Since
some MediaOne/RR affiliates have started to block known router MAC
address ranges, however, you'll probably be better off setting the
H4's WAN port MAC address using the Modem Port MAC Address
feature on the hidden.htm screen.
On the WAN side, the router can act as a DHCP client, or have static
IP info entered, and also support PPPoE authentication.
Opening holes in your firewall can compromise your
LAN's security if done incorrectly.
One of the H4's strengths is its port forwarding ability. Nexland
gives you four different ways to allow inbound (WAN to LAN) access
through the H4:
1) Virtual Servers
This is the simplest form. Just check a box and enter the IP address
of the server on your LAN for common services like POP3, SMTP, Telnet,
2) User-Defined Virtual Servers
For single-port servers not listed in the Virtual Servers page,
you'd use this function. You have the ability to select TCP or
UDP protocol and specify an internal and external port number.
The second feature is handy for mapping multiple webservers, for example.
3) Special Applications
Gamers and teleconferencing/videoconferencing users will appreciate
this feature. It uses a "triggered
map" function to allow multiple computers on the LAN to
have access to applications requiring inbound data access on port
ranges. You don't get simultaneous use of the same ports by
different computers however. One customer at a time! (See the
triggered maps link above for more info.)
4) Exposed Computer
Also known by the term "DMZ computer", this function will
place ONE computer completely outside the H4's NAT firewall. It's
the riskiest way to go, because you're giving up the protection of the
NAT firewall, but sometimes nothing else works for certain applications.
You can also use this function until you find out the specific port
mapping information for an application.
and Other features
I checked to see if I could access the admin functions of the router
from the WAN port and found the HTTP port was safely closed. No
other port scans were performed.
If you want to enable the router for remote administration, go
to the hidden.htm page, enter the IP address (or IP address range)
of the computers that you want to allow to access the H4's admin functions,
then type the WAN port IP address of the H4, followed by :8088.
- Wan port address: 126.96.36.199
- Type http://188.8.131.52:8088 into your browser to reach the
admin server pages.
The router doesn't come with an admin password, however, so you should
set one as soon as possible, especially if you are going to administer
the router remotely.
Outbound access can be controlled by port and by groups of users.
You can identify users by MAC address, workstation name or IP address
and assign them to one of four groups. You can then deny service
entirely to a group or set a profile of ports to block.
Last, but not least, you can set static routing entries in the H4, but
it doesn't support any dynamic routing protocols like RIP1 or RIP2.
One of Nexland's strengths is their ability to pass multiple PPTP and
IPsec VPN client sessions through their routers. They can also pass
one L2TP session. (They've applied for a patent on their multisession
IPsec pass-through technique and have told me that they'll be vigorously
enforcing the patent.) Single PPTP and IPsec servers on the router
LAN side can also be accessed from the WAN side. The H4 can't act
as a VPN tunnel "end-point", however, so you'll have to run
VPN client software on your client machines.
I wasn't able to test the VPN claims, but soon hope to be, courtesy of
a VPN test-bed that we're setting up with Nexland's help.
A little slower than a good number of other routers in this class, but
fast enough for most broadband connections. You wouldn't want to
host a server behind the H4, though, given its slow LAN to WAN transfer
The H4 is a pretty capable box, but there are still some
things it doesn't do:
No content filtering.
No time-based access control
No alarms or reports
Also note that the email sharing capability that is mentioned
in the User Manual has been removed. The H4 also doesn't support
"loopback" of WAN addressing for LAN-side mapped servers,
but I suspect that this capability will be added in a future firmware
release, given the conversation that I had with Nexland.
Finally, note that firmware updating is via TFTP client.
Nexland supplies a Win 95/98 client in the firmware update .zip file.
You're on your own for NT, Win2000, Mac or Linux-based firmware
The H4 (and its sister router the ISB2LAN) are capable boxes, with strong
VPN capabilities. The Nexlands are a good match for users who run
a lot of applications that need forwarded/mapped ports, or who need to
support multiple PPTP and IPSec clients on their LAN.
The downside is that Nexland's focus is really not on the end user, but
more on ISPs and resellers. You can purchase product only through
the Nexland Web site, so you won't find any discounts off the list prices.
Tech support is limited to 9AM - 6PM (East Coast US time zone) Mon-Fri
and is not a free call. And although Nexland recently reduced prices
for both their products by $50 each, the pricing is not what you'd call