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Recommendations
===============
Enable forwarding
-----------------
To enable packet forwarding need edit /etc/sysctl.conf and add or uncomment next:
.. code-block:: sh
net.ipv4.ip_forward=1
net.ipv6.conf.all.forwarding=1
For apply this params now, use command ``sysctl -p`` or after reboot server this params will be applied automatically.
MTU
---
If used vlan-per-user often required 802.1ad standard also called as QinQ or Q-in-Q, then need to set MTU on main interface and S-VLAN, because adding to headed one more field.
Interface which using QinQ usually consist of ``<interface_name>.<S-VLAN>.<C-VLAN>``.
S-VLAN (Service VLAN) is TAG which wrap C-VLAN (Customer VLAN).
As example:
.. code-block:: sh
MTU
1504
| 1504
| | 1500
| | |
eth0.2001.101
| | |
| | C-VLAN
| S-VLAN
Interface
Set up MTU on interface eth0 and interface with S-VLAN
.. code-block:: sh
ip link set eth0 mtu 1504
ip link set eth0.2001 mtu 1504
.. admonition:: Note:
If used ``bonding`` need change MTU on *bonding* (bond0) and *slaves* (eth0, eth1 ...) interfaces.
Increase ARP cache size
-----------------------------
If accel-ppp used as DHCP BRAS important to increase ARP cache size, otherwise you can cache overflow and clients have lost connections. Edit /etc/sysctl.conf and add next:
.. code-block:: sh
net.ipv4.neigh.default.gc_thresh1 = 4096
net.ipv4.neigh.default.gc_thresh2 = 8192
net.ipv4.neigh.default.gc_thresh3 = 12288
net.ipv6.neigh.default.gc_thresh1 = 4096
net.ipv6.neigh.default.gc_thresh2 = 8192
net.ipv6.neigh.default.gc_thresh3 = 12288
For apply this params now, use command ``sysctl -p`` or after reboot server this params will be applied automatically.
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