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SRX active-active 2x IPSec VPN tunnels via 2xISPs to single destination (is this even possible!)

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  • 1.  SRX active-active 2x IPSec VPN tunnels via 2xISPs to single destination (is this even possible!)

    Posted 08-16-2018 02:03

    Hi All... i have been trying to create two active IPSec tunnels via two ISPs to another SRX with a single ISP connection, is this even possible?

     

                  public ip x.x.x.x    st0.0------ISPA-------- st0.0

    SRXA                                                                                      ISPZ public ip z.z.z.z  ----      SRXB

                  public ip y.y.y.y    st0.1-------ISPB------ st0.1

     

    the problem i have is with traffic routing out of SRXA it has to build two seperate IPSec tunnels to a single desination IP address.. It is obviously prefering a single egress interface via ISPA to build the IPSec tunnel to SRXB.... but is there a way to force traffic out via the other ISPB to build the second IPSec tunnel??

    was thinking around source based routing etc.. but it would be for traffic sourced from the SRX itself and as we are using the same destination address it won't work..



  • 2.  RE: SRX active-active 2x IPSec VPN tunnels via 2xISPs to single destination (is this even possible!)

    Posted 08-16-2018 02:18


  • 3.  RE: SRX active-active 2x IPSec VPN tunnels via 2xISPs to single destination (is this even possible!)

    Posted 08-16-2018 02:50

     

    thanks so seperate VRFs are requires to build the tunnels... this is basically to set up redundancy, so we have two IPSec tunnels always up with BGP running over them, then use BGP for determining which tunnel to use... though with the tunnels and BGP instances being in different VRFs, is this the best way to go?



  • 4.  RE: SRX active-active 2x IPSec VPN tunnels via 2xISPs to single destination (is this even possible!)
    Best Answer

     
    Posted 08-16-2018 03:00

    I agree as you note that since the remote side has a single ip address you will need to put the second ISP into a virtual router routing instance so that you can have both tunnels running at the same time.

     

    You can then use logical tunnels to connect that virtual router to your main router and do the routing exchanges and priorities you prefer for the connection usage.

     

    https://kb.juniper.net/InfoCenter/index?page=content&id=KB21260