Comments on: Dynamic Multipoint VPN – Dual hub http://www.exp-networks.be/blog/dynamic-multipoint-vpn-dual-hub/ Networks and security consulting Fri, 13 Jan 2012 19:34:18 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Christophe Lemaire http://www.exp-networks.be/blog/dynamic-multipoint-vpn-dual-hub/comment-page-1/#comment-1998 Christophe Lemaire Fri, 08 Apr 2011 06:27:05 +0000 http://www.exp-networks.be/?p=427#comment-1998 Hi Ezechiel, DHCP servers on Cisco routers are not able to synchronize their DHCP leases DB... But for DHCP redundancy, I see two possibilities: 1) make the two hub routers DHCP server for half of the IP ranges by using <strong>ip dhcp excluded-addresses</strong>. 2) make the two hub routers DHCP server for the entire IP range and rely on <strong>ip dhcp ping packets</strong> to avoid duplicate addresses. Hi Ezechiel,

DHCP servers on Cisco routers are not able to synchronize their DHCP leases DB… But for DHCP redundancy, I see two possibilities:
1) make the two hub routers DHCP server for half of the IP ranges by using ip dhcp excluded-addresses.
2) make the two hub routers DHCP server for the entire IP range and rely on ip dhcp ping packets to avoid duplicate addresses.

]]> By: Ezechiel Succeur http://www.exp-networks.be/blog/dynamic-multipoint-vpn-dual-hub/comment-page-1/#comment-1996 Ezechiel Succeur Fri, 08 Apr 2011 04:00:22 +0000 http://www.exp-networks.be/?p=427#comment-1996 Hi, I have configured DMVPN in a home lab environment successfully, but i have a question pertaining to DHCP server configuration on the HUB routers in your topology. How do you go about configuring an DHCP server for redundancy on the corporation network in your topology? Hi,
I have configured DMVPN in a home lab environment successfully, but i have a question pertaining to DHCP server configuration on the HUB routers in your topology. How do you go about configuring an DHCP server for redundancy on the corporation network in your topology?

]]> By: Christophe Lemaire http://www.exp-networks.be/blog/dynamic-multipoint-vpn-dual-hub/comment-page-1/#comment-260 Christophe Lemaire Wed, 12 May 2010 15:31:31 +0000 http://www.exp-networks.be/?p=427#comment-260 Hi Melek, In order to take advantage of the redundant setup, I would go for HSRP or even GLBP if you want loadbalancing between the two hub routers. Adding a third router with OSPF would introduce a single point of failure. If that router fails then the server would be isolated... Hi Melek,
In order to take advantage of the redundant setup, I would go for HSRP or even GLBP if you want loadbalancing between the two hub routers.
Adding a third router with OSPF would introduce a single point of failure. If that router fails then the server would be isolated…

]]> By: Melek http://www.exp-networks.be/blog/dynamic-multipoint-vpn-dual-hub/comment-page-1/#comment-259 Melek Wed, 12 May 2010 15:00:44 +0000 http://www.exp-networks.be/?p=427#comment-259 Hi, Thank you for this post, it is really interesting. I am trying to implement the same design but I still have a little question about the config of the equipements on the LAN. Let's say I have a server connected directly behind the two hub routers, what I have to configure as default gateway? the first router or the second or should I use HSRP on the internal interfaces? or should I use a third router behind the hub routers and configure it with ospf? Hi,
Thank you for this post, it is really interesting.
I am trying to implement the same design but I still have a little question about the config of the equipements on the LAN. Let’s say I have a server connected directly behind the two hub routers, what I have to configure as default gateway? the first router or the second or should I use HSRP on the internal interfaces? or should I use a third router behind the hub routers and configure it with ospf?

]]>