i observe a limit of 127 interfaces which can be hooked into bat0 where do i find this limit, or does somebody can tell me more about this? Or, if it is a good idea to circumwent this at all? Or, if its even possible in actual protocoll structure.
background: Freifunk with tunneldigger and l2tp tunnel interfaces put a whole lot of l2tp-eth interfaces in a bridge and hook the bridge into batman, which make trouble and also doesnt feel like good practice. (i think to circumvent this limit)
Freifunk with wireguard and gretap also have a lot of gretap tunnel interfaces - but without bridging is limited to 127 interfaces (we also experiment with vxlan which is limited to v4 in bridge forwarding and by this not really an option - idea was to hook vxlan0 in bat0 , which may be similar to bridging l2tp-eth)
you can find the test here (in german) https://forum.freifunk.net/t/500-gretap-tunnel-interfaces-in-batman-einhaeng... or the wireguard in freifunk structures (batman network) here https://forum.freifunk.net/t/wireguard-0-0-20161230-mit-linux-3-18-kernel-un...
the error if you exceed the interface limit in dmesg :
|Error - can't write to file '/sys/class/net/gre127/batman_adv/mesh_iface': Cannot allocate memory|
On Dienstag, 21. Februar 2017 17:24:35 CET Andrew Lunn wrote:
|Error - can't write to file '/sys/class/net/gre127/batman_adv/mesh_iface': Cannot allocate memory|
As the message suggests, you are out of memory. This is not a BATMAN limit, it is a limit from the amount of RAM you have in your device.
contiguous kernel memory to store the per-interface originator data - to be more precise. See batadv_iv_ogm_orig_add_if and all kmalloc*/kfree references with bcast_own/bcast_own_sum
On Dienstag, 21. Februar 2017 17:19:42 CET jens wrote:
i observe a limit of 127 interfaces which can be hooked into bat0 where do i find this limit, or does somebody can tell me more about this? Or, if it is a good idea to circumwent this at all? Or, if its even possible in actual protocoll structure.
And we had this discussion before [1]. Not sure why you are now pretending that this never happened.
Kind regards, Sven
[1] https://lists.open-mesh.org/pipermail/b.a.t.m.a.n/2017-January/016824.html
And we had this discussion before [1]. Not sure why you are now pretending that this never happened.
sorry for that .
i had so much discussions and broad tests with wireguard, different tunnel protocolls (l2tp,gretap,vxlan) the last weeks and simply forget this, because last time this turned out unsatisfying , or i didnt see where to go next - i saved this as "unaswered" and in between it was gone (for me)
b.a.t.m.a.n@lists.open-mesh.org
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Andrew Lunn -
jens -
Sven Eckelmann