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

Hi Benoit,

It will allow multicast packets to go through, which IPv6 depends on. Maybe
there is a problem setting up the multicast filter for that driver / card.

Regards

John


On Mon, 15 Aug 2022 at 12:08, Benoit Chesneau <benoitc@enki-multimedia.eu>
wrote:

> 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
>
>
>
>