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This is the support site for Andrews & Arnold Ltd, a UK Internet provider. Information on these pages is generally for our customers but may be useful to others, enjoy!
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<indicator name="Front">[[File:Menu-B10D.svg|link=:Category:
<h2 style="margin:0 1em 0.5em 0">Currently shipping hardware version</h2>
[[Image:DLink-DSL-320B-Z1-front-view-v2.jpg | frameless
At the time of writing, December 2017, the currently shipping hardware version of the DLink DSL-320B modem/router is the DSL-320B-'''Z1'''. Confusingly, in the past DLink has described several completely different modems as
==Factory default IP, admin password==
{|class="wikitable"
!colspan="2"|
|-
!Username:
|<code>admin</code>
|-
!Password:
|<code>admin</code>
|-
!IP:
|<code>192.168.1.1/24</code>
|}
==Notes==
*AAISP ships these devices for use as straight ethernet modems. Although they are capable of working as (buggy) routers, AA pre-configures them to work in bridge mode only, that is, in simple PPPoE modem-only mode, not operating as routers.
*If you reset
*No per-user or per-line login info or password configuration is required. Information concerned your ISP account or line-specific login and password
*The modem supports 1500 byte IP MTU/MRU (unlike the [[Router - ZyXEL P660R-D1]]) by using ethernet frames with a 1500+8=1508 byte payload. (Your router will also have to support RFC 4638 and 1500+8=1508 byte MTU/MRU as well though for this to be effective. Note that an MTU of 1500 is not supported by BT on 20CN lines.)
▲*Their web interface is quite insecure and in ‘router’ mode they have various critical security bugs, which is why we do strongly suggest that customers never use them configured in 'router' mode. They are sold by AAISP as bridge-only. Older modems, the now obsolete pre-Z (-D1) modems were shipped with their reset button covered to protect it and prevent them from being reset!
*Important - '''BT 20CN''' lines: MTU 1500+8=1508 will not work on old BT 20CN lines because of BT’s limitations, nothing related to this modem.
*Chipset: The currently shipping DSL-320B-Z1 units (at the time of writing, December 2017), and those shipped from approx 2015 onwards, use an old but capable MediaTek/TrendChip chipset. The older -D1 routers were Broadcom-based.▼
*The modems support the ADSL standards G.992.1/G.DMT (‘ADSL1’), G.992.3 (ADSL2) and G.992.5 (ADSL2+) and can either auto-detect the best mode or lock it to just one option. Annex M is supported. SRA is also supported.
*VDSL2 is not supported, so these devices cannot be used with FTTC.
*TR-069 is not supported by AA on these devices, so they cannot automatically be remotely configured, monitored or upgraded by AA.
*It is vital that you '''not expose the LAN-side ethernet interface to users on the LAN''' unless all possible users and devices on the LAN are trusted, because of various critical security bugs in the modem in this respect. Because of such bugs, setting passwords on the modem’s admin web UI etc. is ''not enough''. If your router happens to prevent LAN-internal users from accessing the modem then so much the better, otherwise your main router’s facilities, internal firewalling and access controls could be exploited. A firmware upgrade to release v1.06 or higher could well help fix security problems concerning access without any administrative login. [ftp://ftp.dlink.eu/Products/dsl/dsl-320b/driver_software/DSL-320B_fw_revZ1_1-06_EU_multi_20150807.zip Firmware v1.06]
▲*Chipset: The currently shipping DSL-320B-Z1 units (at the time of writing, December 2017)
*Incorrect manufacturer’s defaults: The default settings shown in the router’s web admin user interface show '''defaults that are very much sub-optimal'''. DSL bitswap is set to ''off'' by default according to the web admin user interface. These settings need to be amended - see following section.
== Initial setup using the web admin interface ==
The manufacturer’s default settings shown in the router’s web admin user interface show defaults that are
These settings need to be configured as follows:
<ul>
<li>ANNEX A/I/J/L/M</li>
<li>Bitswap -
<li>SRA -
''Performance tip for long lines:'' If you have an extremely long phone line (>60
== After each reset to factory settings ==
<p id="post-factory-reset">
After any reset to factory settings you will need to make the following change using the web admin user interface in order to get the device to work properly as a straight modem. (Factory default <code><nowiki>http://192.168.1.1</nowiki></code>, and your own ip address set to something suitable in that same /24 subnet, username=admin, password=admin.)
Go to “Setup” and “ADSL Setup” and there tick “Manual Setup”. Then tick “Bridge Mode”. The “Connection Type” should show “1483 Bridged IP LLC" and the VPI / VCI settings on that page should be set to VPI = 0, VCI = 38. See also article at [http://www.dlink.com/uk/en/support/faq/modems/dsl-modems/dsl_320b/how-to-setup-dsl-320b-revision-z1-in-bridge-mode bridge mode setup article at Dlink website].
If your modem is accessible by users on the LAN, see the notes on security and access given earlier. Ideally consider using your router’s firewall capabilities if possible to block access to the modem. Failing that upgrade the firmware - see earlier notes - and set a suitable administrative password (see the Maintenance menu).
''Performance tip'': the leaner PPPoEoEoA + RFC2684 [obsoletes RFC1483] section 6.2 + '''VC-MUX''' header option (“bridged PDUs: VC-MUX”) is always ''more efficient'' than or the same as the alternative “LLC” header option. Choose 1483 Bridged VC-MUX aka PPPoE VC-MUX in preference to LLC if your exchange supports it, for example if you are using a BT 21CN line or a TalkTalk line. If unsure, use PPPoE / 1483 Bridged IP VC-MUX if there are no problems, otherwise ask AA support. The actual effective speed improvement depends on the length of the packets being sent (because of the absorbing effect of ATM cell padding) and for some packet lengths the performance gain is zero.
Following this you will then also need to make the configuration changes described in the previous section.
== Resetting to factory settings ==
To reset the modem to factory settings, locate the reset button hole on the rear panel of the unit. With the modem powered on, use a paperclip to hold the button down
Wait about 30 seconds to access the modem. The default IPv4 address for the modem’s http admin user interface on the LAN is 192.168.1.1/24. Your own IPv4 address will need to be in the same subnet and different from that of the modem,
== Images ==
=== DLink DSL-320B-Z1 modem ===
[[Image:Dlink-dsl-320b-z1-rearview.png | thumb
=== Rear view of obsolete ‑D1 modem ===
(The image below is of the older generation of routers.)
[[Image:DLINK_320B-reset.jpg| thumb
[[Category:AA Routers|Dlink]]
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