RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.
Bug 1697595 - RFE: Extend ndptool to specify source address for NA
Summary: RFE: Extend ndptool to specify source address for NA
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: libndp
Version: 8.0
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: 8.2
Assignee: Hangbin Liu
QA Contact: Desktop QE
Parth Shah
URL:
Whiteboard:
Depends On:
Blocks: 1738635
TreeView+ depends on / blocked
 
Reported: 2019-04-08 19:09 UTC by Andreas Karis
Modified: 2023-05-17 12:15 UTC (History)
4 users (show)

Fixed In Version: libndp-1.7-3.el8
Doc Type: Enhancement
Doc Text:
.ndptool can now specify a destination address in IPv6 header With this update, the `ndptool` utility can send a Neighbor Solicitation (NS) or a Neighbor Advertisement (NA) message to a specific destination by specifying the address in the IPv6 header. As a result, a message can be sent to addresses other than just the link-local address.
Clone Of:
Environment:
Last Closed: 2020-04-28 16:46:29 UTC
Type: Enhancement
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Issue Tracker RHELPLAN-25382 0 None None None 2023-05-17 12:15:27 UTC
Red Hat Product Errata RHEA-2020:1808 0 None None None 2020-04-28 16:46:35 UTC

Description Andreas Karis 2019-04-08 19:09:32 UTC 
Description of problem:
https://access.redhat.com/solutions/1467893

When sending an unsolicited Neighbour Advertisement when performing IP address failover on IPv6, there is no easy way to send an NA from addresses different than the link-local address.

The article recommends to run:
~~~
ndptool -t na -U -i vlan495 send
~~~

But this only sends out an advertisement for the link-local address:
~~~
(...)
8: eth1.905@eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 state UP qlen 1000
    inet6 2000:10::250/64 scope global 
       valid_lft forever preferred_lft forever
    inet6 fe80::5054:ff:fe91:a4ec/64 scope link 
       valid_lft forever preferred_lft forever
(...)
 [root@undercloud-1 ~]# tcpdump -nne -ieth1.905 icmp6 &
[1] 21088
 [root@undercloud-1 ~]# tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth1.905, link-type EN10MB (Ethernet), capture size 262144 bytes

 [root@undercloud-1 ~]#  ndptool -t na -U -i eth1.905 send
14:55:07.793683 52:54:00:91:a4:ec > 33:33:00:00:00:01, ethertype IPv6 (0x86dd), length 78: fe80::5054:ff:fe91:a4ec > ff02::1: ICMP6, neighbor advertisement, tgt is ::, length 24
~~~

We need an option `-s`, the same as in arping:
~~~
       -s source
              IP source address to use in ARP packets.  If this option is absent, source address is:

              · In DAD mode (with option -D) set to 0.0.0.0.

              · In Unsolicited ARP mode (with options -U or -A) set to destination.

              · Otherwise, it is calculated from routing tables.
~~~

Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1.
2.
3.

Actual results:


Expected results:


Additional info:
Comment 4 Jonathan Maxwell 2019-08-13 01:05:23 UTC 
Take
Comment 5 Jonathan Maxwell 2019-08-13 01:10:23 UTC 
(In reply to Jonathan Maxwell from comment #4)
> Take

Reverting assignee to Eric. I hit the wrong button when mirroring the bz.
Comment 12 Hangbin Liu 2019-12-13 01:21:16 UTC 
Yes, It looks good to me, thanks for the update.
Comment 13 Vladimir Benes 2020-01-09 17:58:13 UTC 
working well with:
ndptool -i veth0 -t na -D fe80::200:ff:fe00:2 -T fe80::200:ff:fe00:1 send

covered in automation
Comment 15 errata-xmlrpc 2020-04-28 16:46:29 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2020:1808
Note You need to log in before you can comment on or make changes to this bug.