Bird Centos 8 Replacement recommendations request

[Kees Meijs | Nefos]

Hi,

On 17-03-2021 11:53, W Templeton wrote:
> 1.your OS version

Sure:
> $ cat /etc/debian_version
> 10.8

Basicly: Debian stable with current updates.

> 2.Debian kernel tweaking

Sure:
> # cat 99-router.conf
> # Enable IP forwarding for IPv4 and IPv6 AF.
> net.ipv4.conf.all.forwarding = 1
> net.ipv6.conf.all.forwarding = 1
>
> # Send ICMP errors from receiving interface and be a nice netizen.
> net.ipv4.icmp_errors_use_inbound_ifaddr = 1
>
> # Disable reverse path filtering.
> net.ipv4.conf.all.rp_filter = 0
> net.ipv4.conf.default.rp_filter = 0
>
> # Allow more IPv6 routes.
> net.ipv6.route.max_size = 2147483647
>
> # Allow more network neighbours.
> net.ipv4.neigh.default.gc_thresh1=16384
> net.ipv4.neigh.default.gc_thresh2=32768
> net.ipv4.neigh.default.gc_thresh3=65536
> net.ipv6.neigh.default.gc_thresh1=16384
> net.ipv6.neigh.default.gc_thresh2=32768
> net.ipv6.neigh.default.gc_thresh3=65536

> # cat 99-tengige.conf
> # 10GB/54MB (56623104)
> net.core.rmem_max = 56623104
> net.core.wmem_max = 56623104
> net.core.rmem_default = 56623104
> net.core.wmem_default = 56623104
> net.core.optmem_max = 40960
> net.ipv4.tcp_rmem = 4096 87380 56623104
> net.ipv4.tcp_wmem = 4096 65536 56623104
>
> # Increase number of incoming connections. The value can be raised to 
> bursts of request, default is 128
> net.core.somaxconn = 1024
>
> # Increase number of incoming connections backlog, default is 1000
> net.core.netdev_max_backlog = 50000
>
> # Maximum number of remembered connection requests, default is 128
> net.ipv4.tcp_max_syn_backlog = 30000
>
> # Increase the tcp-time-wait buckets pool size to prevent simple DoS 
> attacks, default is 8192
> net.ipv4.tcp_max_tw_buckets = 2000000
>
> # Recycle and Reuse TIME_WAIT sockets faster, default is 0 for both
> net.ipv4.tcp_tw_recycle = 1
> net.ipv4.tcp_tw_reuse = 1
>
> # Decrease TIME_WAIT seconds, default is 30 seconds
> net.ipv4.tcp_fin_timeout = 10
>
> # Tells the system whether it should start at the default window size 
> only for TCP connections
> # that have been idle for too long, default is 1
> net.ipv4.tcp_slow_start_after_idle = 0
>
> # If your servers talk UDP, also up these limits, default is 4096
> net.ipv4.udp_rmem_min = 8192
> net.ipv4.udp_wmem_min = 8192

> # cat 99-vrrp.conf
> # For VRRP.
> net.ipv4.ip_nonlocal_bind = 1

Cybertinus: maybe you can give insight in your kernel tweaks as well? 
(Probably very overlapping.)

Cheers,
Kees
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