Router - DLINK 320B: Difference between revisions

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==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' mode. They are sold by AAISP as bridge-only. Older modems, the now obsolete ~~pre-Z (~~-~~D1)~~ model, were shipped with their reset ~~button~~ covered to protect it and prevent them from being reset!

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' 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 ~~them~~ to factory settings using the pin-in-hole technique, then ~~with their factory defaults they~~ will not work at all as straight PPPoE ethernet ~~modems~~. ~~Their~~ configuration must 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.

*If you reset a modem to the factory settings using the pin-in-hole technique, then it will not work at all as a straight PPPoE ethernet modem with its factory defaults. The configuration must 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. ISP account or line-specific login and password ~~info~~ is configured in your router, the DLink modem doesn’t need these values.

*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 router, and the DLink modem doesn’t need these values.

*~~They~~ do support 1500 byte IP MTU/MRU (unlike the [[Router - ZyXEL_P660R-D1]]) 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 ~~too~~ though for this to be effective. ~~Not~~ supported by BT on 20CN lines.

*The modem does support 1500 byte IP MTU/MRU (unlike the [[Router - ZyXEL_P660R-D1]]) 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. MTU of 1500 is not supported by BT on 20CN lines.)

*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.

*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.

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*TR-069 is not supported, so the devices 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 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 explored.

*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.

*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 defaults that are questionable. ~~Bizarrely,~~ DSL bitswap is set to off by default according to the web admin ui. These settings ~~should~~ be ~~fixed~~ - see following section.

*Incorrect manufacturer’s defaults: The default settings shown in the router’s web admin user interface show defaults that are questionable. 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 ==