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06-29-2005, 11:41 PM #1Web Hosting Guru
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8 IPs (5 useable) what are the other 3 for?
I see many hosts promiss 8 IPs (5 useable). But why don't they just say 5 IPs? What are the other 3 IPs for? Viewable from within VLAN, but not from outside, like a NAT system?
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06-29-2005, 11:57 PM #2Newbie
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As I understand it, the host assigns a small block of 8 addresses. 3 are needed to properly setup a network: 1 is used for a router address, 1 for a network address and 1 for subnet broadcast.
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06-30-2005, 12:01 AM #3WHT Addict
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or, they could be reserved for an HSRP configuration. HSRP (Hot Standby Router Protocol) is a way to introduce another layer of redundancy. See: http://www.cisco.com/univercd/cc/td/.../ics/cs009.htm
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06-30-2005, 12:20 AM #4Web Hosting Master
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In a /29 private VLan you have 8 IPs used and 5 that can be utilized for actual servers.. Here's how they break down..
192.168.1.0 Network Address
192.168.1.1 Gateway Address
192.168.1.2 Usable IP
192.168.1.3 Usable IP
192.168.1.4 Usable IP
192.168.1.5 Usable IP
192.168.1.6 Usable IP
192.168.1.7 Broadcast Address
Edited because I hit tab too fast...James Lumby
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06-30-2005, 12:21 AM #5Web Hosting Master
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I see many hosts promiss 8 IPs (5 useable). But why don't they just say 5 IPs?
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06-30-2005, 12:34 AM #6Web Hosting Guru
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"Well, it is probably to satisfy the curiosity of those technie customers."
More like "we are using 8, these 8 are your vlan, but you can only use 5" if you've been around long enough it makes sense. **thinks back of the days of shared /24's
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06-30-2005, 01:06 AM #7Web Hosting Guru
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Well, it is probably to satisfy the curiosity of those technie customers.
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06-30-2005, 04:01 AM #8PHP for breakfast
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Originally posted by rotoiti
Or have an explanation why they are charging you $8 for a second batch of 5 IPs.
If you know you are going to need more ip's... request they assign you a /28 instead of a /29 when you sign up. It'll still cost you your $8 extra dollars, but you'll get all 8 ip's that your paying extra for, usable.Jacob - WebOnce Technologies - 30 Day 100% Satisfaction Guarantee - Over 5 Years Going Strong!
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06-30-2005, 04:18 AM #9Web Hosting Master
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They can just add 8 ips to your vlan when you need it...
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06-30-2005, 05:12 AM #10Web Hosting Guru
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Anyone knows if rc.conf is the only thing I need to bring the extra 4 IPs other than the 1 main ip up?
Currently I have in rc.conf
ifconfig_fxp0="inet xxx.xx.xxx.102 netmask 255.255.255.248"
defaultrouter="xxx.xx.xxx.101"
Ok, so the software router is at 101, and main ip is 102, what more lines I need to add?
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06-30-2005, 06:46 AM #11Junior Guru Wannabe
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06-30-2005, 07:07 AM #12Managed Hosting Expert
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Originally posted by The Broadband Man
They can just add 8 ips to your vlan when you need it...
I've actually been experimenting with routing individual IP's as /32's (which saves a lot of address space), and it does appear to work quite nicely.
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06-30-2005, 09:36 AM #13Web Hosting Master
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Originally posted by burstdan
or, they could be reserved for an HSRP configuration. HSRP (Hot Standby Router Protocol) is a way to introduce another layer of redundancy. See: http://www.cisco.com/univercd/cc/td/.../ics/cs009.htm
HSRP by any configuration I know will yield 3 usable IP's, and 5 "consumed" by the network.Myles Loosley-Millman - admin@prioritycolo.com
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06-30-2005, 09:39 AM #14PHP for breakfast
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Originally posted by RazorBlue - Dan
Well you can't really add IP's to a vlan, (ie expand the vlan) as it's likely IP's infront of and behind your block have been allocated, you'd probably be assigned either an additional vlan, or a brand new bigger block.
I've actually been experimenting with routing individual IP's as /32's (which saves a lot of address space), and it does appear to work quite nicely.
Dan
Granted, it's not as pretty as one big block... but nobody cares about pretty any more... which shows, as your routing /32'sJacob - WebOnce Technologies - 30 Day 100% Satisfaction Guarantee - Over 5 Years Going Strong!
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06-30-2005, 10:28 AM #15Web Hosting Master
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yeah definitely - expand the vlan and add more ips ... not that big of a deal
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07-01-2005, 11:55 PM #16WHT Addict
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Originally posted by porcupine
How do you setup HSRP and still get 5 usable IP's in your VLAN?
HSRP by any configuration I know will yield 3 usable IP's, and 5 "consumed" by the network.
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07-02-2005, 03:13 AM #17Web Hosting Master
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Originally posted by burstdan
Depends on the subnet. We deal mainly with /28s, so that gives us 5 usable. It also, of course, depends on the number of routers that you want to make part of the whole show....Myles Loosley-Millman - admin@prioritycolo.com
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