Re: what to check? no IPV6 pings between nodes on the same switch

From: Benoit Chesneau <benoitc_at_enki-multimedia.eu>
Date: Mon, 15 Aug 2022 10:07:54 UTC
So I noticed that tcpdump was enabling the "promiscuous" mode to the interface. So I tried to do it manually: `ifconfig ql0 promisc` and ping worked even after disabling this mode `ifconfig ql0 -promisc`.

What does happen when the promiscuous mode is enabled? I'm not sure to understand what is the issue :/

Benoît
------- Original Message -------
On Monday, August 15th, 2022 at 11:53, Benoit Chesneau <benoitc@enki-multimedia.eu> wrote:

> Unfortunately I get the same results with rtsold enabled and the interface up. It doesn't seems related to teh switch since link-local ping work :/
>
> Benoît
> ------- Original Message -------
> On Monday, August 15th, 2022 at 11:41, Ronald Klop <ronald-lists@klop.ws> wrote:
>
>> Set rtsold_enable="YES" in rc.conf and restart.
>> Does that help?
>>
>> "
>> DESCRIPTION
>> rtsold is the daemon program to send ICMPv6 Router Solicitation messages
>> on the specified interfaces. If a node (re)attaches to a link, rtsold
>> sends some Router Solicitations on the link destined to the link-local
>> scope all-routers multicast address to discover new routers and to get
>> non link-local addresses.
>>
>> rtsold should be used on IPv6 hosts (non-router nodes) only.
>> "
>>
>> Btw: accept_rtadv makes "rtsol" to run once on startup if you set it in rc.conf and use it to boot the machine. (BTW: for me this does not work well enough, so I run rtsold explicitly.) Setting accept_rtadv by ifconfig will not run rtsol.
>>
>> Regards,
>> Ronald.
>>
>> Van: Benoit Chesneau <benoitc@enki-multimedia.eu>
>> Datum: maandag, 15 augustus 2022 11:25
>> Aan: Benoit Chesneau <benoitc@enki-multimedia.eu>
>> CC: Ronald Klop <ronald-lists@klop.ws>, "freebsd-net@FreeBSD.org" <freebsd-net@freebsd.org>
>> Onderwerp: Re: what to check? no IPV6 pings between nodes on the same switch
>>
>>> OK here is the weird but interesting thing. When I start to capture icmp6 packets using tcpdump `tcpdump -i ql0 icmp6` then ping6 starts to work. Even after stopping the capture. Any idea what could it be ?
>>>
>>> Benoît
>>> ------- Original Message -------
>>> On Monday, August 15th, 2022 at 10:50, Benoit Chesneau <benoitc@enki-multimedia.eu> wrote:
>>>
>>>> Hi,
>>>>
>>>> Thanks for the help :) The nodes can indeed ping each others using the link-local address. What does it means? I tested to set `accept_rtadv` using the ifconfig command without much success.
>>>>
>>>> Here are the ifconfigs, the prefix is the same for all To be sure, I replaced the content by <PREFIX> using sed.
>>>>
>>>> node 1:
>>>>
>>>> ```
>>>> $ ifconfig ql0
>>>> ql0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
>>>> options=507bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,LRO,VLAN_HWFILTER,VLAN_HWTSO>
>>>> ether b4:7a:f1:7a:9c:10
>>>> inet6 <PREFIX>::11 prefixlen 64
>>>> inet6 fe80::b67a:f1ff:fe7a:9c10%ql0 prefixlen 64 scopeid 0x1
>>>> media: Ethernet autoselect (25GBase-SR <full-duplex>)
>>>> status: active  nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
>>>> ```
>>>>
>>>> node 2:
>>>>
>>>> ```
>>>> $ ifconfig ql0
>>>> ql0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
>>>> options=507bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,LRO,VLAN_HWFILTER,VLAN_HWTSO>
>>>> ether b4:7a:f1:7a:99:52
>>>> inet6 <PREFIX>::12 prefixlen 64
>>>> inet6 fe80::b67a:f1ff:fe7a:9952%ql0 prefixlen 64 scopeid 0x1
>>>> media: Ethernet autoselect (25GBase-SR <full-duplex>)
>>>> status: active  nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
>>>> ```
>>>>
>>>> node 3
>>>> ```
>>>> ifconfig ql0
>>>> ql0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
>>>> options=507bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,LRO,VLAN_HWFILTER,VLAN_HWTSO>
>>>> ether b4:7a:f1:18:ff:d8
>>>> inet6 <PREFIX>::13 prefixlen 64
>>>> inet6 fe80::b67a:f1ff:fe18:ffd8%ql0 prefixlen 64 scopeid 0x1
>>>> media: Ethernet autoselect (25GBase-SR <full-duplex>)
>>>> status: active nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
>>>> ```
>>>>
>>>> ------- Original Message -------
>>>> On Monday, August 15th, 2022 at 10:29, Ronald Klop <ronald-lists@klop.ws> wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> My rc.conf config has:
>>>>> ifconfig_genet0_ipv6="inet6 accept_rtadv"
>>>>>
>>>>> Can you post the output of "ifconfig" and "ipfw show"?
>>>>> Can you ping the link-local address of the other hosts?
>>>>>
>>>>> Regards.
>>>>> Ronald.
>>>>>
>>>>> Van: Benoit Chesneau <benoitc@enki-multimedia.eu>
>>>>> Datum: maandag, 15 augustus 2022 08:59
>>>>> Aan: "freebsd-net@FreeBSD.org" <freebsd-net@freebsd.org>
>>>>> Onderwerp: what to check? no IPV6 pings between nodes on the same switch
>>>>>
>>>>>> I have setup 3 nodes on a fresh Freebsd 13.1-RELEASE-p1. They have the same gateway and IPS are in same /64. All 3 nodes are on the same switch (mikrotik) and same vlan untagged.
>>>>>>
>>>>>> I can ping them from an external machine through the router/gateway but the nodes can't ping each others. When I run `ndp-a` it only return the gateway and the node ipv6 (+ their libks) but not the ips of the other nodes.
>>>>>>
>>>>>> Previously these nodes wee under linux and were able to ping each others.
>>>>>>
>>>>>> What could be the issue? What do I need to check?
>>>>>>
>>>>>> Configuration is pretty straightforward:
>>>>>> ```
>>>>>>
>>>>>> hostname="node1.domain.tld"
>>>>>>
>>>>>> keymap="fr.macbook.kbd"
>>>>>>
>>>>>> ifconfig_ql0=""
>>>>>>
>>>>>> ifconfig_ql0_ipv6="inet6 <PREFIX>::11/64"
>>>>>>
>>>>>> ipv6_defaultrouter="<PREFIX>::1"
>>>>>>
>>>>>> sshd_enable="YES"
>>>>>>
>>>>>> ntpd_enable="YES"
>>>>>>
>>>>>> # Set dumpdev to "AUTO" to enable crash dumps, "NO" to disable
>>>>>>
>>>>>> dumpdev="AUTO"
>>>>>>
>>>>>> zfs_enable="YES"
>>>>>>
>>>>>> ```
>>>>>> Others machines are `<PREFIX>::12`, `<PREFIX>::13`Sent from Proton Mail for iOS
>>>>>>
>>>>>> Benoît