Why Is a Cadant router showing up on Wireshark

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My ISP's Modem Online light was going off and then back on. This has happened many times and I've had my ISP tech to check and check the connections. This is a problem. I connected my computer to the Hitron Modem's of ISP's and I got a Cadant Router, not Hitron Modem. The Mac Address of the Hitron Modem is not the same as the Cadant.

 [Protocols in frame: eth:ethertype:ip:udp:dhcp]
    [Coloring Rule Name: UDP]
    [Coloring Rule String: udp]
Ethernet II, Src: **Cadant_X'X:XX:XX** (00:01:XX:XX:XX:XX), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
    Destination: Broadcast (ff:ff:ff:ff:ff:ff)
        <[Destination (resolved): Broadcast]>
        <[Destination OUI: ff:ff:ff]>
        Address: Broadcast (ff:ff:ff:ff:ff:ff)
        <[Address (resolved): Broadcast]>
        <[Address OUI: ff:ff:ff]>
        .... ..1. .... .... .... .... = LG bit: Locally administered address (this is NOT the factory default)
        <.... ..1. .... .... .... .... = LG bit: Locally administered address (this is NOT the factory default)>
        .... ...1 .... .... .... .... = IG bit: Group address (multicast/broadcast)
        <.... ...1 .... .... .... .... = IG bit: Group address (multicast/broadcast)> 

   Type: IPv4 (0x0800)
Internet Protocol Version 4, Src: XX.XXX.XXX.1 (XX.XXX.XXX.1), Dst: 255.255.255.255 (255.255.255.255)

Then Router Advertisement on other frames

Ethernet II, Src: **Cadant_XX:XX:X**X (00:01:5c:XX:XX:XX), Dst: IPv6mcast_01 (33:33:00:00:00:01)
    Destination: IPv6mcast_01 (33:33:00:00:00:01)
        <[Destination (resolved): IPv6mcast_01]>
        <[Destination OUI: 33:33:00]>
        Address: IPv6mcast_01 (33:33:00:00:00:01)
        <[Address (resolved): IPv6mcast_01]>
        <[Address OUI: 33:33:00]>
        .... ..1. .... .... .... .... = LG bit: Locally administered address (this is NOT the factory default)
        <.... ..1. .... .... .... .... = LG bit: Locally administered address (this is NOT the factory default)>
        .... ...1 .... .... .... .... = IG bit: Group address (multicast/broadcast)
        <.... ...1 .... .... .... .... = IG bit: Group address (multicast/broadcast)>
    Source: Src: Cadant_XX:XX:XX (00:01:5c:XX:XX:XX)
        <[Source (resolved): Src: Cadant_XX:XX:XX]> etc. 
                .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
        <.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)>
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
        <.... ...0 .... .... .... .... = IG bit: Individual address (unicast)>
    Type: IPv6 (0x86dd)