----- Original Message -----
From: "Daniel Donnelly" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, May 21, 2001 8:21 PM
Subject: Re: [IMail Forum] Notation conversion
> You say:
> > Our ISP gave me the three ranges shown as their full range that is
> allocated
> > for their dial up service, which needs to be added on the smtp security
> page
> > to the relay for setting to tell imail which ips it is allowed to
forward
> > mail for to avoid spamming as we were recently added to orbs.
>
> I say, why in the world would you want to add all the IPs of your ISPs
> customers, to your IMail server? What about customers that might want to
> come from some other ISP and using a different range of IPs? And if I
spoof
> one of those addresses, I'm now 'golden' in your eyes! Forget about using
> IPs, except for specific machines you really want to relay for (like your
> web server or a friends domain and its server) and have clients use SMTP
> Auth for sending email.
>
> Daniel Donnelly
Daniel
These are IP address for their "DIAL-UP" ranges, which I apologise I did
omit to mention that they are dynamically assigned as I thought it was a
given. Basically all of our customers get given a random IP from this range
each time they dial up so specific addresses cannot be added the whole range
needs to be added along with a few servers and my cable modem IP address at
home all other IPs will be refused when trying to relay mail through our
server and our customers are not allowed to use another ISP dialup to send
mail through our service.
This is standard practice if you have a BT internet account and a virgin net
one you can receive email from both accounts on either dialup but in order
to send you have to dial in to the account you want to send through or set
up the outgoing SMTP server setting to be the one that belongs to which ever
one you are connected to at the time.
Mike
> ________________________________________________________
>
>
> ----- Original Message -----
> From: "MIke Mckay" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Monday, May 21, 2001 3:06 PM
> Subject: Re: [IMail Forum] Notation conversion
>
>
> > I have a reasonable knowledge (not fantastic) of binary maths and TCP-IP
> but
> > have only ever seen slash notation once on a router which needed a full
> > class C range setting up so this was a straight forward 255.255.255.0
/24.
> > Our ISP gave me the three ranges shown as their full range that is
> allocated
> > for their dial up service, which needs to be added on the smtp security
> page
> > to the relay for setting to tell imail which ips it is allowed to
forward
> > mail for to avoid spamming as we were recently added to orbs.
> >
> > Where this is out of my expertise is as you mentioned the fact, that I
> know
> > how to subnet a class A in the second octet a class B in the third and a
> > class C in the fourth. But this is class B subnetting on a class C or a
> > group of 64 class C ranges from 212.1.128.1 up to 212.1.192.255.
> >
> > But this method of subnetting up from a class in the previous octet to
> > combine several consecutive ranges is new to me and as IMAIL will not
let
> me
> > enter the ranges as I was given them I need to find out how they are
> > represented in dotted notation.
> >
> > Apologies if I didn't explain the problem in enough detail
> >
> > Thank you
> >
> > Mike
> >
> > ----- Original Message -----
> > From: "R. Scott Perry" <[EMAIL PROTECTED]>
> > To: <[EMAIL PROTECTED]>
> > Sent: Monday, May 21, 2001 7:46 PM
> > Subject: Re: [IMail Forum] Notation conversion
> >
> >
> > >
> > > >What is the correct dotted notation for the following what I think it
> > > >should be is in brackets but a few of the online subnet calculators
say
> > it
> > > >is incorrect for a class C, but this is all my isp has given me and
> IMAIL
> > > >will not accept /xx notation,
> > > >
> > > >212.1.128.0/19 (255.255.224.0)
> > > >212.157.128.0/18 (255.255.192.0)
> > > >212.159.128.0/17 (255.255.128.0)
> > >
> > > The first set of numbers is the beginning IP address (212.1.128.0).
The
> > > number after the "/" is the number of bits common to all the IP
> addresses
> > > (the first 19 bits of 212.1.128 are always the same; that is, it's
> always
> > > 212.1. followed by a numer starting with 100xxxxx in binary. The
subnet
> > > mask -- 255.255.224.0 is just a bunch of 1's (equal to the /19)
followed
> > by
> > > a bunch of 0's (32 minus the number of 1s).
> > >
> > > >but as it is subnetted in the 3rd octet shouldn't they all be shown
as
> > > >XXX.XXX.0.0 ?
> > >
> > > Shown where? A "/16" would be a Class B, a "/24" would be a Class
> > > C. These are inbetween a Class B and Class C in size.
> > >
> > > Where are you trying to enter these numbers in IMail? I don't believe
> > > IMail has anywhere you can enter IP ranges using the /xx notation.
> > >
> > > If you're familiar with binary numbering, this should seem
> straightforward
> > > once you grasp it. If you aren't familiar with binary numbers, it's
> > > probably best just to ask someone, as it may be very hard to
understand
> > > otherwise.
> > >
> > > -Scott
> > >
> > > Declude: Anti-spam and Anti-virus solutions for IMail.
> > http://www.declude.com
> > >
> > >
> > >
> > > Please visit http://www.ipswitch.com/support/mailing-lists.html
> > > to be removed from this list.
> > >
> > > An Archive of this list is available at:
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> > >
> >
> >
> > Please visit http://www.ipswitch.com/support/mailing-lists.html
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> >
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> >
>
>
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