## RHEL broadcast flag set during DHCP DISCOVER:
(this will tell DHCP server that DHCP response should come as a broadcast BOOT
REPLY)
12:29:42.653772 IP (tos 0x0, ttl 128, id 16963, offset 0, flags [none], proto
UDP (17), length 341)
0.0.0.0.68 > 255.255.255.255.67: [no cksum] BOOTP/DHCP, Request, length
313, htype 32, hlen 0, xid 0x1f49749f, secs 1024, Flags [Broadcast] (0x8000)
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message Option 53, length 1: Discover
Hostname Option 12, length 9: "l-supp-22"
Vendor-Class Option 60, length 8: "MSFT 5.0"
Parameter-Request Option 55, length 13:
Subnet-Mask, Domain-Name, Default-Gateway, Domain-Name-Server
Netbios-Name-Server, Netbios-Node, Netbios-Scope, Router-Discovery
Static-Route, Classless-Static-Route,
Classless-Static-Route-Microsoft, Option 252
Vendor-Option
Client-ID Option 61, length 20: hardware-type 255,
00:00:00:00:00:02:00:00:02:c9:00:00:02:c9:03:00:fc:78:32
END Option 255, length 0
TTL Option 23, length 0
PAD Option 0, length 0, occurs 6
T254 Option 254, length 128: [|rfc1048 128]
## UBUNTU broadcast flag not set during DHCP DISCOVER
06:42:18.949401 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP
(17), length 328)
0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request, length
300, htype 32, hlen 0, xid 0x52bc6268, secs 17, Flags [none] (0
x0000)
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message Option 53, length 1: Discover
Lease-Time Option 51, length 4: 86400
Parameter-Request Option 55, length 7:
Subnet-Mask, BR, Time-Zone, Default-Gateway
Domain-Name, Domain-Name-Server, Hostname
Client-ID Option 61, length 20: hardware-type 255,
00:00:00:00:00:02:00:00:02:c9:00:f4:52:14:03:00:33:d1:91
END Option 255, length 0
PAD Option 0, length 0, occurs 19
** Changed in: isc-dhcp (Ubuntu)
Assignee: (unassigned) => Rafael David Tinoco (inaddy)
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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to isc-dhcp in Ubuntu.
https://bugs.launchpad.net/bugs/1529815
Title:
InfiniBand DHCP flow with PRA and DHCP relay not working
Status in isc-dhcp package in Ubuntu:
In Progress
Bug description:
DHCP client is sending discover with Unicast type request for the offer, in
this configuration of IB to ETH through a relay we need the type to be
broadcast.
The issue is that when using dhclient from the client on Ubuntu (and only on
Ubuntu) with MOFED or inbox driver, we see that that DHCP server offers in
unicast instead of broadcast. It seems there is no way to correct this from the
client side using dhclient configuration file.
this issue exist even when we use always-broadcast statement in configuration
file.
in other vendors we see that discover request type is broadcast.
attached pcap files from working (other vendor) and not working (Ubuntu)
clients.
DHCP CLIENT (IPoIB)
Ubuntu 14.04 kernel 3.13.0-74
Mellanox OFED 3.1-1.0.3 or inbox driver
isc-dhcp-client 4.2.4-7ubuntu12.3
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1529815/+subscriptions
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