Hi all, I've been asked to look at the existing setup for a local adult education authority (sorry don't know correct terminology/TLA's). Currently they have 5 centres which each have a Planet gateway. This gateway consists of a closed headless Linux box connected to an ISDN router. It performs caching and mail server functionality and is administered via a web browser. It does not do NAT/masq as each PC as a public IP address. They only have a limited number of IP, so each site has a finite network size. This setup works quite well, but the phone bills are quite extortionate. I have looked at conventional kilostream connection, but the cost of this is comparable with the current phone bills. I have therefore had a look at ADSL, as BT's Openworld is available to most of the sites. The Openworld 500 Business is only £150 install + £70/qtr and appears as a 4 port eithernet hub. It gives 512K downstream and 256k upstream. On the end of this I would then put a Linux box with squid, Masq, ipchains, etc., and hang the network off the back of it. The only problem I can see is that the ADSL connection is dynamic IP, which means that the site could possibly move without warning. This will of course stuff any inbound traffic such as email. To get round this, I thought about co-hosting a box somewhere and use that as the mail gateway. After all that waffle, I have only a few simple questions. 1) Has anyone had experience with BT openworld? does the service perform as quoted? Is the Dynamic IP *really* dynamic, or are they just saying that? 2) Can anyone see any gaping holes in this setup? 3) Assuming that dynamic means dynamic, does anyone have suggestions on how I can deliver the mail. Ideally, I would like to push the mail using standard smtp if possible rather than using fetchmail etc. 4) As technical info is not very forthcoming from BT, can anyone explain how, if the link is presented as a 4-port ethernet hub, does it manage dynamic IP? Is it done at the router stange and then NAT'd before it appears on the hub? 5) Can anyone come up with a better setup? Cheers, -- Gary Stainburn This email does not contain private or confidential material as it may be snooped on by interested government parties for unknown and undisclosed purposes - Regulation of Investigatory Powers Act, 2000