Jump to content

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!

Router - DLINK 320B: Difference between revisions

Router - DLINK 320B (view source)

Revision as of 02:46, 16 January 2018

46 bytes added ,  16 January 2018
m
→‎Notes: v minor wording and punctuation
Tags: Mobile edit Mobile web edit
m (→‎Notes: v minor wording and punctuation)
==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.
The modem’s admin web interface is quite insecure and in ‘router’ mode they have various critical security bugs, which is why we strongly suggest that customers never use them configured in 'router'‘router’ mode. They are sold by AAISP as bridge-only. Older pre-Z1 modems, such as the now obsolete “-D1” model, were shipped with their reset buttons covered to protect them and prevent them from being reset!
*If you reset a modem to the factory settings using the pin-in-hole technique, then it <b>will not work at all</b> as a straight PPPoE ethernet modem withwhile it still has its factory defaults. The configuration <b>must</b> be altered before use. Ask [https://www.aaisp.net.uk/support.html AA support] for help with this or see [[#post-factory-reset|post-factory reset configuration]] instructions below.
*No per-user or per-line login info or password configuration is required. Information concerned your ISP account or line-specific login and password is configured in your <i>router</i>, and the DLink modem doesn’t need these values.
*The modem does supportsupports 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.)
*Important - <b>BT 20CN</b> lines: MTU 1500+8=1508 will not work on old BT 20CN lines because of BT’s limitations, nothing related to this modem.
*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, so the devices cannot automatically be remotely configured, monitored or upgraded by AA.
*It is vital that you <b>not expose the LAN-side ethernet interface to users on the LAN</b> 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 should be exploited.
*Chipset: The currently shipping DSL-320B-Z1 units (at the time of writing, December 2017) use an old but capable MediaTek/TrendChip chipset. The older “-D1” routers were Broadcom-based.
*Incorrect manufacturer’s defaults: The default settings shown in the router’s web admin user interface show <b>defaults that are very much sub-optimal</b>. DSL bitswap is set to <em>off</em> by default according to the web admin user interface. These settings need to be amended - see following section.
CecilWard
252

edits

Retrieved from ‘http://support.aa.net.uk/Special:MobileDiff/12904’