Scenario:
4 nics
2 nics | 1GB for network connectivity | teamed/bonded (LACP) | 192.168.26.x/24
2 nics | 10GB for iscsi connectivity | 11.11.x.x/24

If iscsi Nics are stealing traffic from the other nics, be certain that iscsi nics have:

  1. Static IP and subnet mask only.
  2. No default gateway.
  3. Uncheck “Register this connection’s addresses in DNS.”
  4. Leave only Internet Protocol Version 4 (TCP/IPv4) enabled. Disable everything else as they are not needed (Client for Microsoft Networks, File and Printer Sharing, etc.); this leave the iscsi nics as storage‑only.