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RE: [FW1] Redundancy & HA



 
... not sure based on the information you are giving... but seems like you  may have an asymmetric routing problemoooOOoo...  =)
 
....we all know that asymmetric routing is not a very secure setup...  (bad, bad, bad)... anyhow...
 
do you have state synchronization enabled?    if not, then:
 
    -physically disconnect firewalls from external (public segments) and internal (private segments) <paranoid?  ;) >
    -fwstop on both fw's
    -on both firewalls make a  sync.conf   file under the $FWDIR/conf  directory...
    -in each sync.conf file (just a text file) place the other firewall's IP address (hint:  echo "ip_address" > sync.conf )
    -do an fwputkey on each fw with other's IP using same passkey (i.e   fw putkey -p <password>  other_fw_ip_address)
    -fwstart... 
    -depending on your policies, you may need to allow the fw's to talk with one another via tcp:259 (if remember ...correct me if I'm wrong...too lazy to look up right now... but it is in the arch. admin. manual)
 
Try to use a dedicated 100mbs full duplex or faster segment for the state sync... however, keep in mind though, that if clients are on segments that access the database faster than 100ms, your connections may drop substantially...
 
Are you using a third party HA (standby or cluster) solution ??... 
 
...may want to think about StoneBeat, Alteon, Rainfinity, etc... since then you can use a single IP address for both FW's having only one default route on your internal and external devices and not worry about asymmetric routing....theoritically that is... <grin>
 
   =)

Amin Tora
ePlus Technology
12001 Sunrise Valley Drive
Reston, VA 20191
Phone:
Fax:       (703) 390-0425
mailto:[email protected]
http://www.eplus.com

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-----Original Message-----
From: Gunjan Mathur @9netave [mailto:[email protected]]
Sent: Friday, December 29, 2000 11:57 PM
To: [email protected]
Subject: [FW1] Redundancy & HA

Hi,
I'm trying to create a redundant environment for HA. my setup is like this
 
100.x.x.1    10.x.1           10.x.x.2
ISP1 ---- FW1 ------------|  DMZ
               |                 |
             LAN              | Server
               |                 | 
ISP2 ---- FW2 ------------|  here
200.x.x.1     10.x.10
 
 
 
On my DMZ server I specify defalut route from both the FW:
ie : route 0.0.0.0  10.x.x.1 AND  route 0.0.0.0 10.x.x.10
 
Now I saw strange behaviour, some time request commig from FW1 lost or some time from FW2 lost.
 
What could be the reason of this?  As I could understand that if request come from FW1 with the real IP (not 10.x.x.) and replies goes back from FW2 (b'cuz  system have two default route) then I lost It can't reach FW1 client.
I'm accessing Database in my DMZ.
 
How I can solve this problem?
 
Thanks
 
Gm