Unable to add a new IP address with a different gateway than the existing gateway

[swe12345]

Problem:
Unable to add a new IP address with a different gateway than the existing gateway

Steps to recreate:
Add a new IP on eth1 with a different gateway than the existing IP using the curl command
curl -k -H "X-Auth-Token: $bmc_token" -H "Content-Type: application/json" -X PATCH -d '{"IPv4StaticAddresses":[{},{"Address": "xx.xx.xx.xx","SubnetMask": "xxx.xxx.xxx.xxx","Gateway":"yy.yy.yy.yy"}]}' https://$bmc/redfish/v1/Managers/bmc/EthernetInterfaces/eth1

Seeing that it is throwing 400 error and giving the error 'IPv4StaticAddresses/1/Gateway' couldn't be written as it is conflicting the value 'IPv4StaticAddresses/0/Gateway'

Expected Results:
Expecting that we must be able to modify the gateway.

[mdmillerii]

This is likely generated in bmcweb here https://github.com/openbmc/bmcweb/blob/a5f87d487143a5478528826bab72b9f5a093f305/redfish-core/lib/ethernet.hpp#L1638
Please check you have 75859: Fix setting gateways | https://gerrit.openbmc.org/c/openbmc/bmcweb/+/75859

[liudkevich-iurii]

Have similar issue.

I have a bmcweb with 75859: Fix setting gateways

When I have one address added via webui bmcweb sets GW from this address config as GW for all addresses on this interface:

"IPv4Addresses": [
    {
        "Address": "172.16.1.100",
        "AddressOrigin": "Static",
        "Gateway": "172.16.1.1",
        "SubnetMask": "255.255.255.0"
    }
],
"IPv4StaticAddresses": [
    {
        "Address": "172.16.1.100",
        "AddressOrigin": "Static",
        "Gateway": "172.16.1.1",
        "SubnetMask": "255.255.255.0"
    }
],

And if I try to add another IP with it's own GW -- all I have got will be 400 error about conflicting GW settings between new IP config and last saved IP config. BUT. after this error bmcweb will set all GW to 0.0.0.0:

"IPv4Addresses": [
    {
        "Address": "172.16.1.100",
        "AddressOrigin": "Static",
        "Gateway": "0.0.0.0",
        "SubnetMask": "255.255.255.0"
    }
],
"IPv4StaticAddresses": [
    {
        "Address": "172.16.1.100",
        "AddressOrigin": "Static",
        "Gateway": "0.0.0.0",
        "SubnetMask": "255.255.255.0"
    }
],

And after that I can successfully add same address, but any next attempt to add new IP will fail.