> For the complete documentation index, see [llms.txt](https://platform9.com/kb/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://platform9.com/kb/pmo/solution/ip-address-not-allocated-to-instance-by-dhcp.md). # IP Address Not Allocated To Instance by DHCP ## Problem * Instance fails to receive IP address from the DHCP server after a reboot. * Packet capture on the tap device of the instance and the bond0 interface shows the Broadcast Request is leaving the tap device but no packets are seen on the bond0 interface. {% tabs %} {% tab title="None" %} ```none $ sudo tcpdump -nnei tapf6715be8-f9 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on tapf6715be8-f9, link-type EN10MB (Ethernet), capture size 262144 bytes fa:16:3e:24:98:2b > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 342: 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from fa:16:3e:24:98:2b, length 300 fa:16:3e:24:98:2b > 33:33:00:01:00:02, ethertype IPv6 (0x86dd), length 157: fe80::ec0c:f912:fd0a:e575.546 > ff02::1:2.547: dhcp6 solicit fa:16:3e:24:98:2b > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 342: 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from fa:16:3e:24:98:2b, length 300 ``` {% endtab %} {% endtabs %} * Packet capture on bond0 interface. {% tabs %} {% tab title="None" %} ```none $ sudo tcpdump -nnei bond0 ether host fa:16:3e:24:98:2b tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on bond0, link-type EN10MB (Ethernet), capture size 262144 bytes ``` {% endtab %} {% endtabs %} ## Environment * Platform9 Managed OpenStack - v3.6.0 and Higher ## Cause There is no physical interface connected to the Bridge br-vlan. {% tabs %} {% tab title="None" %} ```none $ sudo ovs-vsctl show 2ddf08e3-0a83-4ab7-ba2d-fa91b9bdaa64     Manager "ptcp:6640:127.0.0.1"         is_connected: true     Bridge br-vlan         Controller "tcp:127.0.0.1:6633"             is_connected: true         fail_mode: secure         Port br-vlan             Interface br-vlan                 type: internal         Port phy-br-vlan             Interface phy-br-vlan                 type: patch                 options: {peer=int-br-vlan} ``` {% endtab %} {% endtabs %} ## Resolution 1. Add the interface (bond 0) to the bridge (br-vlan). {% tabs %} {% tab title="None" %} ```none $ sudo ovs-vsctl add-port br-vlan bond0 ``` {% endtab %} {% endtabs %} 2. After adding the interface, force the instance to renew the IP address from DHCP. {% tabs %} {% tab title="None" %} ```none $ ipconfig /renew ``` {% endtab %} {% endtabs %} 3. Following is the packet capture of the instance on the tap device and we can see that the DORA process for DHCP completed successfully. {% tabs %} {% tab title="None" %} ```none $ sudo tcpdump -nnei tapf6715be8-f9 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on tapf6715be8-f9, link-type EN10MB (Ethernet), capture size 262144 bytes 02:26:38.049123 fa:16:3e:24:98:2b > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 342: 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from fa:16:3e:24:98:2b, length 300 fa:16:3e:4e:b7:41 > fa:16:3e:24:98:2b, ethertype IPv4 (0x0800), length 391: 172.16.232.1.67 > 172.16.232.28.68: BOOTP/DHCP, Reply, length 349 fa:16:3e:0d:c2:71 > fa:16:3e:24:98:2b, ethertype IPv4 (0x0800), length 391: 172.16.232.0.67 > 172.16.232.28.68: BOOTP/DHCP, Reply, length 349 fa:16:3e:8c:f5:01 > fa:16:3e:24:98:2b, ethertype IPv4 (0x0800), length 391: 172.16.232.2.67 > 172.16.232.28.68: BOOTP/DHCP, Reply, length 349 fa:16:3e:24:98:2b > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 369: 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from fa:16:3e:24:98:2b, length 327 fa:16:3e:0d:c2:71 > fa:16:3e:24:98:2b, ethertype IPv4 (0x0800), length 465: 172.16.232.0.67 > 172.16.232.28.68: BOOTP/DHCP, Reply, length 423 ``` {% endtab %} {% endtabs %} --- # Agent Instructions This documentation is published with GitBook. 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