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Internet failover on Cisco ASA 5500 series Primary ISP is on DHCP address and so is backup. Always defaults to backup

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I had SLA MONITOR setup on my ASA and working fine for months. All traffic was routing through my primary connection. I rebooted my ASA after a firmware upgrade.

When it came back, it would always default to the backup line. I disconnected the backup line and then all traffic would use the primary line after about 5 seconds.

The moment I connect the backup line, within 5 seconds, all traffic would be routed through that.

  • Primary line is on dhcp with ip address dhcp setroute with gateway as ISP router
  • Secondary line is natted on 192.168.1.200, gateway is natted 192.168.1.1 (mobile router) which has a gateway of ISP router, so i have a double NAT situation there, but it works.

Firmware 9.14(4)23

The gateway of last resort is the gateway on my primary line.

Any ideas how to fix, as I can only find docs for static IPs on outside interfaces, and not with DHCP

Ron Trunk avatar
in flag
Please edit your question to include your (sanitized) configuration. Otherwise, we're just guessing. This question might be better asked on [Network Engineering](https://networkengineering.stackexchange.com/).
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