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[doc] backup-redmine/2018-08-24, backup-redmine/2019-09-14, master: doc: batman-adv/DAT_DHCP_Snooping (df09ba2)
by postmaster＠open-mesh.org 15 Sep '19

15 Sep '19

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[doc] backup-redmine/2018-08-24, backup-redmine/2019-09-14, master: doc: batman-adv/DAT_DHCP_Snooping (f71de70)
by postmaster＠open-mesh.org 15 Sep '19

15 Sep '19

1 0

[doc] backup-redmine/2018-08-24, backup-redmine/2019-09-14, master: doc: batman-adv/ffda-BCAST.1d.2018-05-10.png (ee547ff)
by postmaster＠open-mesh.org 15 Sep '19

15 Sep '19

1 0

[doc] backup-redmine/2018-08-24, backup-redmine/2019-09-14, master: doc: batman-adv/DAT_DHCP_Snooping (51189d4)
by postmaster＠open-mesh.org 15 Sep '19

15 Sep '19

Repository : ssh://git@open-mesh.org/doc On branches: backup-redmine/2018-08-24,backup-redmine/2019-09-14,master >--------------------------------------------------------------- commit 51189d44e1b7f2ea800fb14f769bc16df55c2a56 Author: Linus Lüssing <linus.luessing(a)c0d3.blue> Date: Mon May 7 01:30:42 2018 +0000 doc: batman-adv/DAT_DHCP_Snooping >--------------------------------------------------------------- 51189d44e1b7f2ea800fb14f769bc16df55c2a56 batman-adv/DAT_DHCP_Snooping.textile | 2 ++ 1 file changed, 2 insertions(+) diff --git a/batman-adv/DAT_DHCP_Snooping.textile b/batman-adv/DAT_DHCP_Snooping.textile index 446bf7d..92c7338 100644 --- a/batman-adv/DAT_DHCP_Snooping.textile +++ b/batman-adv/DAT_DHCP_Snooping.textile @@ -8,6 +8,8 @@ _Many ARP Requests from a batman-adv gateway server_ In larger mesh networks a significant (~30 kbit/s with ~1000 nodes) amount of ARP Requests can be observed. These are mostly broadcasted from nodes configured as a gateway and DHCP server. +The batman-adv Distributed ARP Table so far is unable to reduce the broadcast overhead for these specific ARP Requests from gateways. + h2. Statistics The following statistics were gathered at Freifunk Ostholstein on one of their gateway servers. Their mesh network consists of 300 nodes. The statistics show some details regarding the ARP Requests this specific gateway (a2:d9:c8:47:67:5d) generated:

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[doc] backup-redmine/2018-08-24, backup-redmine/2019-09-14, master: doc: batman-adv/DAT_DHCP_Snooping (43a8db2)
by postmaster＠open-mesh.org 15 Sep '19

15 Sep '19

1 0

[doc] backup-redmine/2018-08-24, backup-redmine/2019-09-14, master: doc: batman-adv/bcast-arp-req-gw.png (807bb25)
by postmaster＠open-mesh.org 15 Sep '19

15 Sep '19

1 0

[doc] backup-redmine/2018-08-24, backup-redmine/2019-09-14, master: doc: batman-adv/bcast-arp-req-gw.dia (6e1ccdb)
by postmaster＠open-mesh.org 15 Sep '19

15 Sep '19

1 0

[doc] backup-redmine/2018-08-24, backup-redmine/2019-09-14, master: doc: batman-adv/DAT_DHCP_Snooping (82feb59)
by postmaster＠open-mesh.org 15 Sep '19

15 Sep '19

Repository : ssh://git@open-mesh.org/doc On branches: backup-redmine/2018-08-24,backup-redmine/2019-09-14,master >--------------------------------------------------------------- commit 82feb59f4a171f79a51f2a3588e39a24725744d4 Author: Linus Lüssing <linus.luessing(a)c0d3.blue> Date: Mon May 7 01:28:01 2018 +0000 doc: batman-adv/DAT_DHCP_Snooping >--------------------------------------------------------------- 82feb59f4a171f79a51f2a3588e39a24725744d4 batman-adv/DAT_DHCP_Snooping.textile | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/batman-adv/DAT_DHCP_Snooping.textile b/batman-adv/DAT_DHCP_Snooping.textile index e425a57..446bf7d 100644 --- a/batman-adv/DAT_DHCP_Snooping.textile +++ b/batman-adv/DAT_DHCP_Snooping.textile @@ -2,11 +2,11 @@ h1. DAT DHCP Snooping h2. Problem Scenario - +!{width:30%}bcast-arp-req-gw.png! _Many ARP Requests from a batman-adv gateway server_ -In larger mesh networks a significant (~30 kbit/s with ~1000 nodes) amount of ARP Requests which are broadcasted by batman-adv can be observed. +In larger mesh networks a significant (~30 kbit/s with ~1000 nodes) amount of ARP Requests can be observed. These are mostly broadcasted from nodes configured as a gateway and DHCP server. h2. Statistics @@ -85,7 +85,7 @@ Total: 282190 (100%) Here there are two interesting points: -A) Nearly 90% of all ARP Requests this gateway send were falling back to a batman-adv broadcast. +A) Nearly 90% of all ARP Requests this gateway sent were falling back to a batman-adv broadcast. B) Of those 90%, 87% were left unanswered.

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[doc] backup-redmine/2018-08-24, backup-redmine/2019-09-14, master: doc: batman-adv/DAT_DHCP_Snooping (72fe1e0)
by postmaster＠open-mesh.org 15 Sep '19

15 Sep '19

Repository : ssh://git@open-mesh.org/doc On branches: backup-redmine/2018-08-24,backup-redmine/2019-09-14,master >--------------------------------------------------------------- commit 72fe1e03a9b085c7e2fec9dfcf7022a06a79b62c Author: Linus Lüssing <linus.luessing(a)c0d3.blue> Date: Mon May 7 01:15:58 2018 +0000 doc: batman-adv/DAT_DHCP_Snooping >--------------------------------------------------------------- 72fe1e03a9b085c7e2fec9dfcf7022a06a79b62c batman-adv/DAT_DHCP_Snooping.textile | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/batman-adv/DAT_DHCP_Snooping.textile b/batman-adv/DAT_DHCP_Snooping.textile index 0746a99..e425a57 100644 --- a/batman-adv/DAT_DHCP_Snooping.textile +++ b/batman-adv/DAT_DHCP_Snooping.textile @@ -135,10 +135,10 @@ h3. Result The following picture shows the amount of broadcasted ARP Request traffic before and after applying and configuring these patches at Freifunk Darmstadt (800 batman-adv nodes): -!{width:50%}ffda-BCAST-ARP-REQUEST-@.kbits-1d.2018-04-06.png! +!{width:50%}ffda-BCAST-ARP-REQUEST-@.kbits-1d.2018-04-06.png!:https://www.open-mesh.org/attachments/844/ffda-BCAST-ARP-REQUEST-@.kbits-1d.2018-04-06.png At about 23:00 this feature was enabled in their network on all gateway servers. Since then it is running there with no issues reported so far. -A month later it still looks like this: +A month later it still looks like this (note the scale): -!{width:50%}ffda-BCAST-ARP-REQUEST-@.kbits-1d.2018-05-07.png!:ffda-BCAST-ARP-REQUEST-@.kbits-1d.2018-04-06.png \ No newline at end of file +!{width:50%}ffda-BCAST-ARP-REQUEST-@.kbits-1d.2018-05-07.png!:https://www.open-mesh.org/attachments/845/ffda-BCAST-ARP-REQUEST-@.kbits-1d.2018-05-07.png \ No newline at end of file

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[doc] backup-redmine/2018-08-24, backup-redmine/2019-09-14, master: doc: batman-adv/ffda-BCAST-ARP-REQUEST-@.kbits-1d.2018-05-07.png (21afdef)
by postmaster＠open-mesh.org 15 Sep '19

15 Sep '19

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