What does mean "block of addresses"

I've got a reply by ISP, which I, in all honesty, do no understand.

They told me they allocated a:

"block of public address 123.123.123.123/30" - what does that mean?

Also what is VIP DGW?

thanks
mrmutAsked:
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Pete LongTechnical ConsultantCommented:
It will be a network address, type it into my subnet calculator and it will tell you the usable range, and the broadcast address :)

So in your example;

123.123.123.120 is the subnet address
255.255.255.252 is the mask
123.123.123.123 is the broadcast address
123.123.123.121 to 122 are usable (you get 2 hosts with a /30 address)



Pete
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Pete LongTechnical ConsultantCommented:
VIP =Virtual IP
DGW=Default Gateway
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DP230Network AdministratorCommented:
Maybe your Router/modem's interface will have IP of 123.123.123.121, the other side of ISP has IP address of 123.123.123.122

IP address always go with subnet mask, it defines the number of networks and hosts which a address block can serve.
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mrmutAuthor Commented:
Thanks!
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