[pve-devel] dnsmasqd needs extra ip

[Alexandre DERUMIER]

>>I am sure this is a problem, because most people have small blocks (4, 8 or 16 IPs). 
>>Yes, but with blocks range, they generaly use 1 ip as gateway (see my schema),which can be also use for dhcp. 

I also forget to say, with a block range, you can assign ip in 2 ways
example with 4ip blocks (/30 network)

1) like my schema, you use /30 for you vms.
   That mean that only 2 ip are usable
   172.168.0.1 (network)
   172.158.0.2 (first usable ip)
   172.158.0.3 (first usable ip)
   172.158.0.4 (brodcast address)

 and on 2 usables ip, you need to use 1 for gateway/dhcp on proxmox host


2) or you route the 4 ips from proxmox host with /32 range with
   route add 172.168.0.1/32 gw tap1
   route add 172.168.0.2/32 gw tap2
   route add 172.168.0.3/32 gw tap3
   route add 172.168.0.4/32 gw tap4

  (this is similar as if you buy 1 failover ip on ovh)


I don't known if we can done some dhcp tricks with a /32, they are no broadcast address, don't known how it's work.

----- Mail original ----- 

De: "Alexandre DERUMIER" <aderumier at odiso.com> 
À: "Dietmar Maurer" <dietmar at proxmox.com> 
Cc: pve-devel at pve.proxmox.com 
Envoyé: Mercredi 28 Août 2013 06:44:55 
Objet: Re: [pve-devel] dnsmasqd needs extra ip 


>>I miss the route for 172.16.1.1 and gateway 172.16.0.1 on the host? 

oh,sorry, I wan to say 172.168.0.10,172.168.1.10 instread 172.168.1.1,172.16.0.1 

> #route add 172.168.0.10 gw tapguest1 
> #route add 172.168.1.10 gw tapguest2 


>>I am sure this is a problem, because most people have small blocks (4, 8 or 16 IPs). 
Yes, but with blocks range, they generaly use 1 ip as gateway (see my schema),which can be also use for dhcp. 

>>But so far I also have no idea to avoid the usage of an extra IP. 
How does it work with userland kvm nic and internal dhcp server ? 





----- Mail original ----- 

De: "Dietmar Maurer" <dietmar at proxmox.com> 
À: "Alexandre DERUMIER" <aderumier at odiso.com> 
Cc: pve-devel at pve.proxmox.com 
Envoyé: Mercredi 28 Août 2013 06:23:55 
Objet: RE: dnsmasqd needs extra ip 


> indivual ips: (aka failover ip) 
> 
> http://www.ovh.co.uk/dedicated_servers/ip_failover.xml 
> Theses ip are individuals and non contiguous, routed from ovh routers to 
> proxmox main ip 
> 
> This is really a problem because we don't have extra ip for dhcp. 
> 
> ex: client buy failoverip 172.16.0.1/32 && 172.16.1.1/32 routed to main 
> proxmox ip 192.168.1.2 
> 
> client 10.0.0.2----------->external router(192.168.1.1)--------- 
> >(192.168.1.2)proxmox-------------->(172.16.0.10/32)guest1 
> -------------- 
> >(172.16.1.10/32)guest2 
> 
> host config: 
> auto eth0 
> iface eth0 inet static 
> address 192.168.1.2 
> netmask 255.255.255.0 
> gateway 192.168.1.1 
> 
> #route add 172.168.0.10 gw tapguest1 
> #route add 172.168.1.10 gw tapguest2 
> 
> guest1 config: 
> iface eth0 inet static 
> address 172.16.0.10 
> netmask 255.255.255.255 
> gateway 172.16.0.1 
> 
> guest2 config: 
> iface eth0 inet static 
> address 172.16.1.10 
> netmask 255.255.255.255 
> gateway 172.16.1.1 


I miss the route for 172.16.1.1 and gateway 172.16.0.1 on the host? 

> range block ip: (aka failover ripe/arin block) 
> http://www.ovh.com/us/dedicated-servers/arin_ip_block.xml 
> 
> Not too much a problem,minimum block size is 4 ips 

I am sure this is a problem, because most people have small blocks (4, 8 or 16 IPs). 

> ex: client buy failoverip range block 172.16.0.0/24 && 172.16.1.0/24 routed to 
> main proxmox ip 192.168.1.2 
> 
> proxmox host have one ip of the range, which is used as gateway by guests 
> and also used as dhcp server ip 
> 
> client 10.0.0.2---->external router(192.168.1.1)------ 
> >(192.168.1.2)proxmox(vmbr1 172.16.0.1/24)--------->(172.16.0.10/24)guest 
> (vmbr2 172.16.1.1/24)--------- 
> >(172.16.1.10/24)guest 
> 
> host config: 
> auto eth0 
> iface eth0 inet static 
> address 192.168.1.2 
> netmask 255.255.255.0 
> gateway 192.168.1.1 
> 
> guest1 config: 
> iface eth0 inet static 
> address 172.16.0.10 
> netmask 255.255.255.0 
> gateway 172.16.0.1 
> 
> guest2 config: 
> iface eth0 inet static 
> address 172.16.1.10 
> netmask 255.255.255.0 
> gateway 172.16.1.1 

But so far I also have no idea to avoid the usage of an extra IP. 
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