On 15/2/2025 7:28 μ.μ., Wietse Venema via Postfix-users wrote:
The evidence suggests that different versions of Rocky Linux have
failed an important real-world test.
That's true. It would be interesting if someone could cross-check this
behavior in any RHEL / AlmaLinux / Scientific Linux / Ora
On 15/2/2025 5:18 μ.μ., Viktor Dukhovni via Postfix-users wrote:
Have you tried adding "options edns0" to your resolv.conf? The "A"
RRset for this name exceeds 512 bytes, and so, absent edns0 can only be
returned via TCP, and some Linux versions had no TCP fallback support in
the libc resolver.
Nikolaos Milas via Postfix-users:
> A final question: Should we enable the same option for IPv6? (I'd guess
> yes, but please confirm.)
Well, IPv6 addresses take up more space than IPv4 addresses.
> > The Dilbert cartoon still applies, however, you may have workarounds
> > other than switching f
On Sat, Feb 15, 2025 at 07:08:20PM +0200, Nikolaos Milas via Postfix-users
wrote:
> > Have you tried adding "options edns0" to your resolv.conf? The "A"
> > RRset for this name exceeds 512 bytes, and so, absent edns0 can only be
> > returned via TCP, and some Linux versions had no TCP fallback s
On Sun, Feb 16, 2025 at 11:14:44AM +1100, Viktor Dukhovni via Postfix-users
wrote:
> > 154.52.2.229 154.52.2.243 154.52.2.248 154.52.2.241 154.52.2.235
> > 154.52.2.233 154.52.2.238 154.52.2.239 154.52.2.149 154.52.2.234
> > 154.52.2.246 154.52.2.237 154.52.2.247 154.52.2.249 154.52.2.244
> > 154
On Sat, Feb 15, 2025 at 08:49:01PM +0100, Gerald Galster via Postfix-users
wrote:
> >> Yes, but what you really need is working TCP fallback, when the DNS
> >> response is truncated due to exceeding the UDP packet size limit (even
> >> happens with EDNS0, the default UDP buffer size could still b
On Sat, Feb 15, 2025 at 10:54:58AM +0200, Nikolaos Milas via Postfix-users
wrote:
> On 15/2/2025 1:45 π.μ., Wietse Venema via Postfix-users wrote:
> > It is possible to override these system library functions by providing
> > your own alternatives with LD_PRELOAD.
>
> Thanks Wietse, it makes sen
Viktor Dukhovni via Postfix-users:
> On Sat, Feb 15, 2025 at 10:54:58AM +0200, Nikolaos Milas via Postfix-users
> wrote:
>
> > On 15/2/2025 1:45 ?.?., Wietse Venema via Postfix-users wrote:
> > > It is possible to override these system library functions by providing
> > > your own alternatives wi
Byunghee HWANG via Postfix-users:
> Hellow,
>
> Does Postfix support QMTP? Well, i haven't found the relevant
> manaual yet.
If it is not documented then it is not supported.
> Reference:
> https://lists.debian.org/debian-isp/2002/11/msg00330.html
That was 25 years ago. Some things have changed
On 15/2/2025 11:40 π.μ., Viktor Dukhovni via Postfix-users wrote:
I don't recall seeing you testing with "getaddrinfo" (and perhaps also
"getnameinfo" to see whether it is slow PTR lookup that is the problem).
It may also help to perform tcpdumps to see how long the delay is
between that client c
On Sat, Feb 15, 2025 at 04:45:41PM +0200, Nikolaos Milas via Postfix-users
wrote:
> > I don't recall seeing you testing with "getaddrinfo" (and perhaps also
> > "getnameinfo" to see whether it is slow PTR lookup that is the problem).
> > It may also help to perform tcpdumps to see how long the de
On 15/2/2025 7:37 μ.μ., Viktor Dukhovni via Postfix-users wrote:
Yes, but what you really need is working TCP fallback, when the DNS
response is truncated due to exceeding the UDP packet size limit (even
happens with EDNS0, the default UDP buffer size could still be too small
for some queries).
>> Yes, but what you really need is working TCP fallback, when the DNS
>> response is truncated due to exceeding the UDP packet size limit (even
>> happens with EDNS0, the default UDP buffer size could still be too small
>> for some queries). Just EDNS0 is not the whole story, it just pushes
>> ou
On 15/2/2025 1:45 π.μ., Wietse Venema via Postfix-users wrote:
It is possible to override these system library functions by providing
your own alternatives with LD_PRELOAD.
Thanks Wietse, it makes sense.
Would it be sufficient to LD_PRELOAD 2.34 libs for smptd or we should do
so for other exe
Hellow,
Does Postfix support QMTP? Well, i haven't found the relevant manaual
yet.
Reference:
https://lists.debian.org/debian-isp/2002/11/msg00330.html
Sincerely, Byunghee
--
^고맙습니다 _布德天下_ 감사합니다_^))//
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