Question

Looking for design diagram for Dual Routers, BGP and active/standby ASA5510 w/ DMZ

Asked by: MarkJenks

I am working on designing a project and have found all of the individual docs to put each part of this together.  But I have not found anything that can help me design the whole thing.

Dual Cisco router, each connected to their own ISP using BGP.  (Cisco 3825 & 2811)
-ISP's at 15MB/15MB each
Pair of ASA5510's in Active/Standby
DMZ (shared between the ASA's)
IPSEC VPN, and IPSEC L2L

Anyone done anything like this before?  I'm someone has, but I can't find the one good doc that combines all of these key points.

It looks like I can run IPSEC VPN on Active/Standby, so that should mean I can also do L2L?
The IPSEC doesn't have to be part of the config, but it would be nice.

I am also planning on using a 3750's stack divided into VLANs to support each segment.

Thanks for the help!

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Asked On
2009-03-12 at 13:21:23ID24225573
Tags

cisco bgp asa firewall dmz DR

Topics

Network Routers

,

Cisco PIX Firewall

,

Network Design & Methodology

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Answers

 

by: MarkJenksPosted on 2009-03-12 at 18:49:17ID: 23875503

Do the ASA's do GLBP?  Would that help on the external interface of the ASA's?

 

by: chouckhamPosted on 2009-03-13 at 03:43:50ID: 23877613

Hello,

Im sure someone will be with you shortly with your question.
In the mean time, may I suggest that, it might be an idea to move your SQL and Storage Boxes out of the DMZ into another higher security VLAN of their own.

This reduces the risk of unauthorised access to these boxes via the DMZ.

Thanks,
Craig

 

by: MarkJenksPosted on 2009-03-13 at 04:40:58ID: 23877978

I agree completely, but as it was designed, it's too hard to move them right now.    The DMZ is new, it is currently housed at a Tier-1 provider and we are moving it in house.

 

by: lrmoorePosted on 2009-03-13 at 05:40:06ID: 23878498

Use OSPF between the two ISP facing routers and the ASA pair. Just advertise a default route from each.
Otherwise you will not get any load balancing or load sharing only failover from router 1 to router 2

I would also suggest keeping VLAN 10, the "outside" vlan on a totally separate switch (or switch pair) to protect from vlan bleed over or arp poisoning.

 

by: MarkJenksPosted on 2009-03-13 at 06:13:40ID: 23878790

If I use OSPF, would that not be for Active/Active?

If not, could you please explain?

Also, I would love to put VLAN10 on another stack, but I need to keep this on a stack to not have a single point of failure, which is what I am trying to design here.

 

by: MarkJenksPosted on 2009-03-13 at 06:22:39ID: 23878871

Do you have a good diagram or configs on how to put this together?

I'm in the design stage and trying to get the most info together to get it right the first time.

 

by: MarkJenksPosted on 2009-03-14 at 11:22:53ID: 23887918

Okay, maybe I'm asking too much here.

Let's get back to some basic questions that I need figured out.

I have done dual ASA Active/Passive with a single router with BGP and 2 ISP's.  

But what I am trying to create is a config that doesn't have a single point of failure, like having one router, and using a 3750 stack to do the switching.

So, BGP on each router, sharing the same ASN, subnet behind them is my /24.

Should I go Active/Active with the ASA's?  Or stick with Active/Passive, so I can do my IPSEC traffic also and not have a 3rd firewall?

LRMore mentioned using OSPF behind the BGP routers, what would that look like?   I've done OSPF before.

Anyone?

 

by: MarkJenksPosted on 2009-03-15 at 11:21:29ID: 23892483

This is what I have so far...

ISP-a
 
interface GigabitEthernet0/0
 description ISP-a
 bandwidth 1000000
 ip address x.x.33.22 255.255.255.252
 ip access-group inbound_acl_06102008 in
interface GigabitEthernet0/1
 ip address x.x.120.1 255.255.255.248
router bgp xxxxx
 no synchronization
 bgp log-neighbor-changes
 bgp dampening
 network x.x.120.0
 network x.x.120.0 mask 255.255.255.0
 neighbor x.x.33.21 remote-as 1000
 neighbor x.x.33.21 description 1stISP
 neighbor x.x.33.21 password 7 xxxxxxxxxx
 neighbor x.x.33.21 prefix-list input-route-filter in
 neighbor x.x.33.21 prefix-list announce-out out
 no auto-summary 
 
router ospf 0.0.0.0
 network x.x.120.0 255.255.255.0
 default originate
 
ip route x.x.120.0 255.255.255.0 Null0
ip route x.x.120.0 255.255.255.0 GigabitEthernet0/1
 
ip access-list extended inbound_acl_06102008
# Block unroutables and things we don't want
!
ip prefix-list announce-out seq 10 permit x.x.120.0/24 le 32
ip prefix-list announce-out seq 20 deny 0.0.0.0/0 le 32
!
ip prefix-list input-route-filter seq 10 deny 10.0.0.0/8 le 32
ip prefix-list input-route-filter seq 25 deny 127.0.0.0/8 le 32
ip prefix-list input-route-filter seq 40 deny 169.254.0.0/16 le 32
ip prefix-list input-route-filter seq 45 deny x.x.120.0/24 le 32
ip prefix-list input-route-filter seq 70 deny 192.168.0.0/16 le 32
ip prefix-list input-route-filter seq 85 deny 224.0.0.0/3 le 32
ip prefix-list input-route-filter seq 90 permit 0.0.0.0/0 le 24
ip prefix-list input-route-filter seq 100 permit 0.0.0.0/0
 
 
----------------------------------------------------------------------------
ISP-b
 
interface GigabitEthernet0/0
 description ISP-b
 bandwidth 1500000
 ip address 206.40.x.x 255.255.255.252
 ip access-group inbound_acl_06102008 in
interface GigabitEthernet0/1
 ip address x.x.120.2 255.255.255.248
router bgp xxxxx
 no synchronization
 bgp log-neighbor-changes
 bgp dampening
 network x.x.120.0
 network x.x.120.0 mask 255.255.255.0
 neighbor 206.40.x.x remote-as 1001
 neighbor 206.40.x.x description 2ndISP
 neighbor 206.40.x.x password 7 xxxxxxxxxx
 neighbor 206.40.x.x prefix-list input-route-filter in
 neighbor 206.40.x.x prefix-list announce-out out
 no auto-summary
 
router ospf 0.0.0.0
 network x.x.120.0 255.255.255.0
 default originate
 
ip route x.x.120.0 255.255.255.0 Null0
ip route x.x.120.0 255.255.255.0 GigabitEthernet0/1
 
ip access-list extended inbound_acl_06102008
# Block unroutables and things we don't want
!
ip prefix-list announce-out seq 10 permit x.x.120.0/24 le 32
ip prefix-list announce-out seq 20 deny 0.0.0.0/0 le 32
!
ip prefix-list input-route-filter seq 10 deny 10.0.0.0/8 le 32
ip prefix-list input-route-filter seq 25 deny 127.0.0.0/8 le 32
ip prefix-list input-route-filter seq 40 deny 169.254.0.0/16 le 32
ip prefix-list input-route-filter seq 45 deny x.x.120.0/24 le 32
ip prefix-list input-route-filter seq 70 deny 192.168.0.0/16 le 32
ip prefix-list input-route-filter seq 85 deny 224.0.0.0/3 le 32
ip prefix-list input-route-filter seq 90 permit 0.0.0.0/0 le 24
ip prefix-list input-route-filter seq 100 permit 0.0.0.0/0
 
----------------------------------------------------------------------------
ASA-a
 
interface Ethernet0/0
nameif outside
security-level 0
ip address x.x.120.2 255.255.255.0 standby x.x.120.3
!
interface Ethernet0/1
nameif inside
security-level 100
ip address 10.200.1.2 255.255.255.0 standby 10.200.1.3
!
interface Ethernet0/2
nameif dmz
security-level 50
ip address 172.16.17.1 255.255.255.0 standby 172.16.17.2
 
 
failover
failover lan unit primary
failover lan interface failover Ethernet0/3
failover key *****
failover link failover Ethernet0/3
failover interface ip failover 192.168.55.1 255.255.255.0 standby 192.168.55.2
failover interface ip state 192.168.56.1 255.255.255.0 standby 192.168.56.2
 
ospf 0.0.0.0
 network x.x.120.0 255.255.255.0
----------------------------------------------------------------------------
ASA-b
 
failover
failover lan unit secondary
failover lan interface failover Ethernet0/3
failover key *****
failover interface ip failover 192.168.55.1 255.255.255.0 standby 192.168.55.2
                                              
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by: MarkJenksPosted on 2009-03-17 at 12:06:15ID: 23911389

No one is helping.    Closing this out due to lack of activity.

20120131-EE-VQP-002

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