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Message #54313
[Bug 1606895] [NEW] DHCP offer wrong router
Public bug reported:
Hello,
I have a public network with 3 sub-nets and associated gateways:
public3 XX.0/27 IPv4 XX.30
public XX.64/28 IPv4 XX.78
public2 XX.160/28 IPv4 XX.174
>From time to time, I saw that on instantiated VM, the default route to
the GW was missing.
Checking the DHCP answer, I noticed the proposed router was a wrong one.
We get the .174 instead of .78
see below DHCP offer :
Bootstrap Protocol (ACK)
Message type: Boot Reply (2)
Hardware type: Ethernet (0x01)
Hardware address length: 6
Hops: 0
Transaction ID: 0x70542239
Seconds elapsed: 0
Bootp flags: 0x0000 (Unicast)
0... .... .... .... = Broadcast flag: Unicast
.000 0000 0000 0000 = Reserved flags: 0x0000
Client IP address: 0.0.0.0 (0.0.0.0)
Your (client) IP address: XX.XX.XX.66 (XX.XX.XX.66)
Next server IP address: XX.XX.XX.65 (XX.XX.XX.65)
Relay agent IP address: 0.0.0.0 (0.0.0.0)
Client MAC address: fa:16:3e:9c:ea:c4 (fa:16:3e:9c:ea:c4)
Client hardware address padding: 00000000000000000000
Server host name not given
Boot file name not given
Magic cookie: DHCP
Option: (53) DHCP Message Type (ACK)
Length: 1
DHCP: ACK (5)
Option: (54) DHCP Server Identifier
Length: 4
DHCP Server Identifier: XX.XX.XX.65 (XX.XX.XX.65)
Option: (51) IP Address Lease Time
Length: 4
IP Address Lease Time: (86400s) 1 day
Option: (58) Renewal Time Value
Length: 4
Renewal Time Value: (43200s) 12 hours
Option: (59) Rebinding Time Value
Length: 4
Rebinding Time Value: (75600s) 21 hours
Option: (1) Subnet Mask
Length: 4
Subnet Mask: 255.255.255.240 (255.255.255.240)
Option: (28) Broadcast Address
Length: 4
Broadcast Address: XX.XX.XX.79 (XX.XX.XX.79)
Option: (15) Domain Name
Length: 14
Domain Name: openstacklocal
Option: (12) Host Name
Length: 18
Host Name: host-XX-XX-XX-66
Option: (3) Router
Length: 4
Router: XX.XX.XX.174 (XX.XX.XX.174)
Option: (121) Classless Static Route
Length: 32
Subnet/MaskWidth-Router: 169.254.169.254/32-XX.XX.XX.161
Subnet/MaskWidth-Router: XX.XX.XX.0/27-0.0.0.0
Subnet/MaskWidth-Router: XX.XX.XX.64/28-0.0.0.0
Subnet/MaskWidth-Router: default-XX.XX.XX.174
Option: (6) Domain Name Server
Length: 8
Domain Name Server: XX
Domain Name Server: XX
Option: (255) End
Option End: 255
Could that it be an issue related to multiples sub-nets?
** Affects: neutron
Importance: Undecided
Status: New
** Tags: dhcp multiple router sub-nets
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Engineering Team, which is subscribed to neutron.
https://bugs.launchpad.net/bugs/1606895
Title:
DHCP offer wrong router
Status in neutron:
New
Bug description:
Hello,
I have a public network with 3 sub-nets and associated gateways:
public3 XX.0/27 IPv4 XX.30
public XX.64/28 IPv4 XX.78
public2 XX.160/28 IPv4 XX.174
From time to time, I saw that on instantiated VM, the default route to
the GW was missing.
Checking the DHCP answer, I noticed the proposed router was a wrong
one.
We get the .174 instead of .78
see below DHCP offer :
Bootstrap Protocol (ACK)
Message type: Boot Reply (2)
Hardware type: Ethernet (0x01)
Hardware address length: 6
Hops: 0
Transaction ID: 0x70542239
Seconds elapsed: 0
Bootp flags: 0x0000 (Unicast)
0... .... .... .... = Broadcast flag: Unicast
.000 0000 0000 0000 = Reserved flags: 0x0000
Client IP address: 0.0.0.0 (0.0.0.0)
Your (client) IP address: XX.XX.XX.66 (XX.XX.XX.66)
Next server IP address: XX.XX.XX.65 (XX.XX.XX.65)
Relay agent IP address: 0.0.0.0 (0.0.0.0)
Client MAC address: fa:16:3e:9c:ea:c4 (fa:16:3e:9c:ea:c4)
Client hardware address padding: 00000000000000000000
Server host name not given
Boot file name not given
Magic cookie: DHCP
Option: (53) DHCP Message Type (ACK)
Length: 1
DHCP: ACK (5)
Option: (54) DHCP Server Identifier
Length: 4
DHCP Server Identifier: XX.XX.XX.65 (XX.XX.XX.65)
Option: (51) IP Address Lease Time
Length: 4
IP Address Lease Time: (86400s) 1 day
Option: (58) Renewal Time Value
Length: 4
Renewal Time Value: (43200s) 12 hours
Option: (59) Rebinding Time Value
Length: 4
Rebinding Time Value: (75600s) 21 hours
Option: (1) Subnet Mask
Length: 4
Subnet Mask: 255.255.255.240 (255.255.255.240)
Option: (28) Broadcast Address
Length: 4
Broadcast Address: XX.XX.XX.79 (XX.XX.XX.79)
Option: (15) Domain Name
Length: 14
Domain Name: openstacklocal
Option: (12) Host Name
Length: 18
Host Name: host-XX-XX-XX-66
Option: (3) Router
Length: 4
Router: XX.XX.XX.174 (XX.XX.XX.174)
Option: (121) Classless Static Route
Length: 32
Subnet/MaskWidth-Router: 169.254.169.254/32-XX.XX.XX.161
Subnet/MaskWidth-Router: XX.XX.XX.0/27-0.0.0.0
Subnet/MaskWidth-Router: XX.XX.XX.64/28-0.0.0.0
Subnet/MaskWidth-Router: default-XX.XX.XX.174
Option: (6) Domain Name Server
Length: 8
Domain Name Server: XX
Domain Name Server: XX
Option: (255) End
Option End: 255
Could that it be an issue related to multiples sub-nets?
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