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Secondary/Tertiary DNS to mirror hosted DNS (123-Reg)
by Mark Rogers 19 Nov '07

19 Nov '07

Anyone with 123-Reg hosted domains will probably be aware that their DNS died over the weekend. This ought not be possible, given the redundancy, but for about 24hrs nobody with domains hosted with 123-Reg (well nobody who uses their DNS anyway) will have had web/email. That includes me and several of my clients :-( Therefore I want to set up a DNS server on my own hosted server to act as (probably) a tertiary server (maybe secondary, not sure it matters for the sake of this question). In an ideal world I'd have a server which was fully (automatically) synced with 123-Reg's servers for all the domains I'm interested in. Given that I don't have any control over 123-Reg's servers I'm not sure how close I can get to that. I've also never set up DNS from scratch before (I've used various hosted DNS options which don't require me to think), but I think this would be a good time to learn more about DNS configuration. Not least because as a tertiary server it won't normally matter if I get it wrong :-) First question is pretty basic therefore: where do I start? -- Mark Rogers // More Solutions Ltd (Peterborough Office) // 0845 45 89 555 Registered in England (0456 0902) at 13 Clarke Rd, Milton Keynes, MK1 1LG

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How to execute a simple command during boot (before mounts)
by Chris G 19 Nov '07

19 Nov '07

I have a Freecom network disk which needs the following to be executed before I can mount it using an entry in /etc/fstab :- echo 0 > /proc/fs/cifs/LinuxExtensionsEnabled Is there any neat way I can get this command executed during the boot sequence before the entries in /etc/fstab are mounted? -- Chris Green

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Freedomware Gamefest
by MJ Ray 19 Nov '07

19 Nov '07

Thanks to Bristol Wireless Cooperative for the tip-off. I think ALUG has some bzflaggers... Date: Sat, 17 Nov 2007 16:16:33 -0000 From: "Ben Green" Message-ID: <op.t1x15vj50bw284@spinach> Subject: [bristol] Freedomware Gamefest Anyone heard of this before? Well you have now. http://www.freedomware-gamefest.com/ [snip!] Regards, -- MJ Ray http://mjr.towers.org.uk/email.html tel:+44-844-4437-237 - Webmaster-developer, statistician, sysadmin, online shop builder, consumer and workers co-operative member http://www.ttllp.co.uk/ - Writing on koha, debian, sat TV, Kewstoke http://mjr.towers.org.uk/

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Norwich 2nd Thursday announce mails
by Jonathan McDowell 16 Nov '07

16 Nov '07

Can I have a volunteer to take over the monthly Norwich 2nd Thursday announcement mails please? I missed this month's and while I could blame the starting a new job and being in the US and just generally being busier than normal I think it makes more sense for someone who is regularly able to go to post the mails. J. -- ] http://www.earth.li/~noodles/ [] I think he's a few bytes short of [ ] PGP/GPG Key @ the.earth.li [] a checksum. [ ] via keyserver, web or email. [] [ ] RSA: 4DC4E7FD / DSA: 5B430367 [] [

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3rd Monday Monthly Ipswich Social Meeting : The Milestone, Woodbridge Road
by samwise 16 Nov '07

16 Nov '07

The monthly "Third Monday" ALUG Ipswich Social Meeting returns next week (Monday 19th Nov) at 20:00: The Milestone Beer House 5 Woodbridge Road IPSWICH IP4 2EA Tel: 01473 252425 Map/Directions URI: http://maps.google.co.uk/?q=IP4+2EA The Milestone pub is in the centre of Ipswich, near the now-defunct Odeon cinema and not far from The Regent Theatre. There is more information on the venue, including car parking info, on the ALUG wiki: http://www.alug.org.uk/wiki/moin.cgi/Meetings All are welcome, novices and experienced users. Hopefully, it shouldn't be too hard to find the pack, look for those huddled around a laptop! Feel free to ask for further information on the Main ALUG mailing list. This month's meeting is another mainly social one - as our imagination for tutorial subjects was running thin last month (and we've had a few top ones in recent months). However, me and PeteT did say we try and have a look at some linux games ... Hope to see you there, Peter.

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ISP-relay SMTP question
by ted.harding＠nessie.mcc.ac.uk 15 Nov '07

15 Nov '07

Hi Folks, I'm hoping someone with the expertise can help me! In connection with trying to diagnose email delivery problems to a particular domain, I'd like to know the answer to the following. My email procedure is: 1. Compose the email "off-line" in my MUA (XFMail) 2. "Send" it -- so it goes in the outbox 3. Really send it (batch send) -- XFMail hands the outbox over to sendmail which then does SMTP with the mail server of my ISP (Zen). Up to this point, there is no problem; and receipt of a "check" Bcc: sent to me on an external email account via the ISP verifies that the ISP accepted the mail for delivery. And of course I usually have no problems with delivery of emails to their destinations by the ISP. Except for this one domain. Now the question. When my sendamil is doing its SMTP with Zen's mail server, the first substantive request it will make is mail from: <whatever.my.sendmail.uses> After the mail has been received by the ISP, the ISP's mail servers will try to initiate connections with the destination domain's mail server. Again, once a connnection is established, the first substantive request it will make will be of the form: mail from: <whatever.my.ISP.uses> My question is: What (if any) is the relationship between <whatever.my.sendmail.uses> and <whatever.my.ISP.uses> ?? Does <whatever.my.ISP.uses> take the email address from the "From:" header in the email? From the "envelope-from"? Or does it uses its own version, as in (e.g.): mailer-daemon(a)zen.co.uk Or what? One aspect of the background to this question is that, when I try myself to do a (test) manual SMTP dialogue with one of the remote domains mail servers, while I may well get through and successfully send the mail, on many other occasions I will get a response to "mail from:" on the lines of mail from: Ted.Harding(a)manchester.ac.uk 451 4.3.2 Please try again later which will be repeated indefinitely if I keep trying. So I'm wondering if it may be a negative response to the email address used in the "mail from:" request, or has some other reason. Since I don't know whether Zen's mail server would use the same (or similar) email address in its own "mail from:" request, I can't (as yet) link the delivery failures I get with my own SMTP dialogue with the delivery failures when Zen tries to forward my emails to the destination domain. [And, by the way, how should I interpret the error message 451 4.3.2 Please try again later ??] With thanks, Ted. -------------------------------------------------------------------- E-Mail: (Ted Harding) <ted.harding(a)nessie.mcc.ac.uk> Fax-to-email: +44 (0)870 094 0861 Date: 15-Nov-07 Time: 11:36:23 ------------------------------ XFMail ------------------------------

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Motherboard memory problem
by Chris G 15 Nov '07

15 Nov '07

I have just bought an extra 4Gb memory for my Abit AB9 Pro motherboard, I have plugged it in and it works fine (so I now have 6Gb) but I'm not convinced I understand the optimum way to install the memory. There are four memory slots numbered 1, 2, 3 and 4, they are laid out as two pairs, 1 and 2 close together and 3 and 4 close together. The manual is very ambiguous/confusing, it says:- To reach the optimum performance in dual-channel configurations, install identical DDR2 DIMM pairs for each channel. So does that mean a matched pair in both slots of channel A and a matched pair in both slots of channel B? That's not how the dealer had installed the existing memory and it isn't how their examples are either (see below). It's pretty definite that Channel A is slot 1 and slot 2, Channel B is slot 3 and slot 4, that at least is clear enough. However this is where it gets confusing, the sample layouts are for "Dual Channel Asymmetric" and "Dual Channel Symmetric", it doesn't say which is the best and they don't make a lot of sense. For example some "Dual Channel Asymmetric" layouts are:- Slot1 256Mb, Slot2 256Mb, Slot3 512Mb, Slot4 512Mb Slot1 256Mb, Slot2 256Mb, Slot3 256Mb, Slot4 512Mb Whereas a "Dual Channel Symmetric" examples are:- Slot1 512Mb, Slot2 empty, Slot3 512Mb, Slot4 empty Slot1 256Mb, Slot2 256Mb, Slot3 empty, Slot4 512Mb Slot1 256Mb, Slot2 512Mb, Slot3 256Mb, Slot4 512Mb Slots 1 and 3 are pink, slots 2 and 4 are red. I *suspect* that I have it right, as follows:- Slot1 1Gb, Slot2 2Gb, Slot3 1Gb, Slot4 2Gb (the dealer installed 1Gb were already in slots 1 and 3) but I'd really like to *know* that I have it right! -- Chris Green

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Re: [ALUG] more about sendmail
by mbm 13 Nov '07

13 Nov '07

>> You shouldn't use a CNAME for a host that you want to receive mail. I >> suggest you try changing it to an A record instead. > > To quote RFC1123 section 5.2.2: > > The domain names that a Sender-SMTP sends in MAIL and RCPT commands MUST > have been "canonicalized," i.e., they must be fully-qualified principal > names or domain literals, not nicknames or domain abbreviations. A > canonicalized name either identifies a host directly or is an MX name; it > cannot be a CNAME. > > Can someone explain why this restriction exists (or point to a good resource)? One obvious point is DNS inefficiency. If the sending MTA gets back an answer to an MX query pointing to a CNAME it then has to query again to get the A record. If there is a CNAME chain (and there may well be) then there have to be multiple queries until the A record is reached. Check out the Bat book. Mick

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More about sendmail sending to local machine
by Chris G 13 Nov '07

13 Nov '07

I'm beginning to think this is impossible! :-) I've been doing some Google searching about the file local-host-names, one hit suggested trying the following to see what sendmail views as local domains:- echo '$=w' | sendmail -bt ... and what does it return .... ADDRESS TEST MODE (ruleset 3 NOT automatically invoked) Enter <ruleset> <address> > home home.isbd.net localhost [192.168.1.1] isbd.net Which certainly looks as if sendmail thinks that home.isbd.net is the local machine. However when I tried using 'mail' to send a message from root to chris(a)home.isbd.net (I used 'mail' to ensure little else was involved) it *still* tries to send it out to the outside world. The entries in maillog are:- Nov 11 11:38:20 home sendmail[7883]: lABBcJ9h007883: from=root, size=64, class=0, nrcpts=1, msgid=<200711111138.lABBcJ9h007883(a)home.isbd.net>, relay=root@localhost Nov 11 11:38:20 home sendmail[7884]: lABBcKac007884: from=<root(a)home.isbd.net>, size=354, class=0, nrcpts=1, msgid=<200711111138.lABBcJ9h007883(a)home.isbd.net>, proto=ESMTP, daemon=MTA, relay=localhost.localdomain [127.0.0.1] Nov 11 11:38:20 home sendmail[7883]: lABBcJ9h007883: to=chris(a)home.isbd.net, ctladdr=root (0/0), delay=00:00:01, xdelay=00:00:00, mailer=relay, pri=30064, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (lABBcKac007884 Message accepted for delivery) Nov 11 11:40:20 home sendmail[7886]: lABBcKac007884: to=<chris(a)84-45-228-40.no-dns-yet.enta.net>, delay=00:02:00, xdelay=00:02:00, mailer=esmtp, pri=120354, relay=84-45-228-40.no-dns-yet.enta.net. [84.45.228.40], dsn=4.0.0, stat=Deferred: Connection timed out with 84-45-228-40.no-dns-yet.enta.net. -- Chris Green

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How to send mail locally, solved but I don't really understand why
by Chris G 11 Nov '07

11 Nov '07

Well I finally found a way to send mail to local recipients, quite by chance really. I have a POP3 mailbox set up at Gradwell.net to allow me to send mail to 'myself' on my home machine (I read just about all of my mail on a remote machine at Gradwell) which comes in useful occasionally when I want to send a file to my home Linux box. This is set up in my isbd.net on Gradwell so it's home(a)isbd.net. I just occasionally run mutt locally on my desktop machine and collect mail from this POP3 mailbox. So, I realised that one way around my problem of sending mail to myself on the desktop machine would be to put home(a)isbd.net as the alias for root mail in /etc/aliases. Before doing this I tried sending mail to home(a)isbd.net from my desktop machine, it failed with "Error sending message, child exited 67 (User unknown.).", huh? I then realised that this meant that sendmail was trying to send this *locally* and there's no user called 'home' on this machine. Euraka!!! If I send mail to chris(a)isbd.net on my desktop machine it gets sent to the local user chris and *not* to the place where it would get sent if it was sent from anywhere else on the internet (chris(a)isbd.net is one of my 'real' E-Mail addresses). So, problem solved, I can put:- root: chris(a)isbd.net at the end of /etc/aliases and all the root mail will get to me locally. Quite *why* it's like this is anybody's guess! :-) -- Chris Green

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