Moin,
> I will also poke in the linux direction so they can fix their ICMP6
> rate limiting issue.
Another FYI on this: Not ratelimiting ICMP6 Packet-too-big
(Type 2) and Echo/Reply (Type 128/129) is the default setting in
Linux, see Documentation/networking/ip-sysctl.rst l2776 of the
Linux sour
Moin,
quick follow-up:
- I forgot to mention: pf should be off (or block return must be
commented, at least) given the async routing going on for this to hit.
- I just tested this with an added in linux, and it indeed leads to a
packet storm, even though it is more fiddly to create the state where
Moin,
ok, had a hunch, and i think i got closer to this. I can now semi-
reproduce this in a lab environment. with six OpenBSD 7.4. I guess the
last missing component is bringing in a Linux router, i.e., in a pure
openbsd setup it is not that bad because openbsd does not send type 2
ad infinum (un
Moin
> How does the route look like where the path MTU is saved?
> netstat -rn has a Mtu column.
Just noticed i sent route -n -T0 get instead of netstat -rn;
gw02.dus01.as59645.net ~ # route -T0 exec netstat -rn | grep
2a06:d1c0::b
2a06:d1c0::b/1282a06:d1c0::dead:bee
Moin,
> Note that I have also written some scapy script to test path MTU
> discovery. /usr/src/regress/sys/netinet/pmtu/tcp_connect.py
> and tcp_connect6.py
> Sometimes these tests fail, so PMTU may have bugs. Or my tests are
> just unreliable.
Awesome, thanks!
> How does the route look like
Hi,
Thanks for the detailed bug report.
Note that I have also written some scapy script to test path MTU
discovery. /usr/src/regress/sys/netinet/pmtu/tcp_connect.py
and tcp_connect6.py
Sometimes these tests fail, so PMTU may have bugs. Or my tests are
just unreliable.
How does the route look l
Moin,
I have run into some issues with v6 PMTUD on OpenBSD 7.4, and am
somewhat at a loss on how to proceed finding a proper reproducer.
I first brushed into MTU issues when some of my mailers suddenly
started to put out ~50mbit of traffic with no apparent reason. Back
then further debugging lead
