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| author | David Gibson <david@gibson.dropbear.id.au> | 2024-10-18 12:35:52 +1100 |
|---|---|---|
| committer | Stefano Brivio <sbrivio@redhat.com> | 2024-10-18 20:27:51 +0200 |
| commit | 53176ca91d176ea15d8abf3b1429e43bc93e516c (patch) | |
| tree | 9cb95b8eb757277016c3b9aac69b12382e8fa35b /test/perf | |
| parent | 75b9c0feb0b54b040a8c49f160cfc2defe28c045 (diff) | |
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test: Wait for DAD on DHCPv6 addresses
After running dhclient -6 we expect the DHCPv6 assigned address to be
immediately usable. That's true with the Fedora dhclient-script (and the
upstream ISC DHCP one), however it's not true with the Debian
dhclient-script. The Debian script can complete with the address still
in "tentative" state, and the address won't be usable until Duplicate
Address Detection (DAD) completes. That's arguably a bug in Debian (see
link below), but for the time being we need to work around it anyway.
We usually get away with this, because by the time we do anything where the
address matters, DAD has completed. However, it's not robust, so we should
explicitly wait for DAD to complete when we get an DHCPv6 address.
Link: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1085231
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Diffstat (limited to 'test/perf')
| -rw-r--r-- | test/perf/passt_tcp | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/test/perf/passt_tcp b/test/perf/passt_tcp index 089d953..5978c49 100644 --- a/test/perf/passt_tcp +++ b/test/perf/passt_tcp @@ -116,6 +116,8 @@ iperf3k ns # Reducing MTU below 1280 deconfigures IPv6, get our address back guest dhclient -6 -x guest dhclient -6 __IFNAME__ +# Wait for DAD to complete +guest while ip -j -6 addr show tentative | jq -e '.[].addr_info'; do sleep 0.1; done tl TCP RR latency over IPv4: guest to host lat - |