[RHEL 8.8] Kdump over NFS using FQDN fails when the system has two interfaces.

Issue

• Kdump fails to generate the vmcore file over NFS using FQDN name when the system has two interfaces.
• The condition to trigger this issue is,
  • The NIC1's IP address must fall within the DNS server's network range.
  • The NIC's IP address must fall within the NFS server's network range.
  • The KDUMP_COMMANDLINE_APPEND with ifname=<> ip=<>, refer.
• The kdump fails with below logs.

[   70.737299] kdump[548]: dump path "/kdumproot/ccfkdump" is not mounted, trying to mount...
[   70.765322] kdump.sh[550]: mount.nfs: Failed to resolve server kdump-server: Name or service not known    <<<-------
[   70.810298] kdump[552]: failed to dump to "/kdumproot/ccfkdump", it's not a mount point!
[   70.852691] kdump[554]: saving vmcore failed