# Eth1 gets random mac address

**URL:** <https://community.solid-run.com/t/eth1-gets-random-mac-address/861>\
**Category:** NXP LX2160\
**Created:** [July 8, 2024, 5:08pm UTC](https://community.solid-run.com/t/eth1-gets-random-mac-address/861 "2024-07-08T17:08:39Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![joema](https://avatars.discourse-cdn.com/v4/letter/j/a9adbd/32.png) [@joema](https://community.solid-run.com/u/joema)\
**Post date:** [July 8, 2024, 5:08pm UTC](https://community.solid-run.com/t/eth1-gets-random-mac-address/861/1 "2024-07-08T17:08:39Z")

</div>

We’re using serdes1 = 14 (so having 100GE.1 in addition to the primary network interface).

we’ve added dpmac1 in addition to the existing dpmac17 inside u-boot’s fsl-lx2160a-cex7.dts:

```auto
&dpmac1 {
	status = "okay";
	phy-connection-type = "xgmii";
};

&dpmac17 {
	status = "okay";
	phy-handle = <&rgmii_phy1>;
	phy-connection-type = "rgmii-id";
};

```

U-boot boot logs seems promising:

Net: eth0: DPMAC1@xgmii, eth1: DPMAC17@rgmii-id [PRIME]

We’ve added a bunch of NIC entries to the EEPROM’s TLV:

```auto
# tlv_parser -b 3 -a 0x57
EEPROM Contents:
        Product Name: LX2160A_CEX7
        MAC Address base: fa:00:e7:00:ff:f8
        MAC Size: 9
        Manufacturer Country: IL
        Vendor Name: Solidrun
        CRC32: 70 32 9d 90 

```

eth0 gets the 2nd NIC address as expected:

```auto
# ip a
4: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
    link/ether fa:00:e7:00:ff:f9 brd ff:ff:ff:ff:ff:ff

```

but when we add eth1 we see it has a random mac address:

```auto
# ls-addni dpmac.1
[120.948293] fsl_mc_allocator dpbp.1: Adding to iommu group 3
[120.956261] fsl_mc_allocator dpmcp.53: Adding to iommu group 3
[120.964476] fsl_mc_allocator dpcon.31: Adding to iommu group 3
[120.971736] fsl_mc_allocator dpcon.30: Adding to iommu group 3
[120.979493] fsl_mc_allocator dpcon.29: Adding to iommu group 3
[120.987024] fsl_mc_allocator dpcon.28: Adding to iommu group 3
[120.994541] fsl_mc_allocator dpcon.27: Adding to iommu group 3
[121.000720] fsl_mc_allocator dpcon.26: Adding to iommu group 3
[121.007715] fsl_mc_allocator dpcon.25: Adding to iommu group 3
[121.015494] fsl_mc_allocator dpcon.24: Adding to iommu group 3
[121.022356] fsl_mc_allocator dpcon.23: Adding to iommu group 3
[121.030101] fsl_mc_allocator dpcon.22: Adding to iommu group 3
[121.036868] fsl_mc_allocator dpcon.21: Adding to iommu group 3
[121.043509] fsl_mc_allocator dpcon.20: Adding to iommu group 3
[121.051232] fsl_mc_allocator dpcon.19: Adding to iommu group 3
[121.058133] fsl_mc_allocator dpcon.18: Adding to iommu group 3
[121.065689] fsl_mc_allocator dpcon.17: Adding to iommu group 3
[121.073214] fsl_mc_allocator dpcon.16: Adding to iommu group 3
[121.081197] fsl_dpaa2_eth dpni.1: Adding to iommu group 3
[121.275258] fsl_dpaa2_eth dpni.1: Probed interface eth1
Created interface: eth1 (object:dpni.1, endpoint: dpmac.1)

# ip a
4: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
    link/ether fa:00:e7:00:ff:f9 brd ff:ff:ff:ff:ff:ff
5: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 1e:76:f2:61:91:e5 brd ff:ff:ff:ff:ff:ff

```

any idea how to control the mac address of that eth1?