doubled tcp max orphan limit

the default value on the machines seems to be 262144 but on some larger
experiments dmesg will sometimes show the following logs:
[Fri Aug  8 05:01:42 2025] TCP: too many orphaned sockets
[Fri Aug  8 05:01:42 2025] TCP: too many orphaned sockets
[Fri Aug  8 05:01:42 2025] TCP: too many orphaned sockets
[Fri Aug  8 05:01:42 2025] TCP: too many orphaned sockets
[Fri Aug  8 05:01:42 2025] TCP: too many orphaned sockets
[Fri Aug  8 05:01:42 2025] TCP: too many orphaned sockets
[Fri Aug  8 05:01:42 2025] TCP: too many orphaned sockets
[Fri Aug  8 05:01:42 2025] TCP: too many orphaned sockets
[Fri Aug  8 05:01:42 2025] TCP: too many orphaned sockets
[Fri Aug  8 05:01:42 2025] TCP: too many orphaned sockets

hopefully increasing this limit will fix that.
https://serverfault.com/questions/624911/what-does-tcp-too-many-orphaned-sockets-mean
the second answer on server faul also says it could be due to tcp memory
limits:
```
The possible cause of this error is system run out of socket memory.Either you need to increase the socket memory(net.ipv4.tcp_mem) or find out the cause of memory consumption

        [root@test ~]# cat /proc/sys/net/ipv4/tcp_mem
         362688  483584  725376
So here in my system you can see 725376(pages)*4096=2971140096bytes/1024*1024=708 megabyte

So this 708 megabyte of memory is used by application for sending and receiving data as well as utilized by my loopback interface.If at any stage this value reached no further socket can be made until this memory is released from the application which are holding socket open which you can determine using netstat -antulp.
```
but for now I will just increase the max orphans and see if that is
enough.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/main.rs b/src/main.rs
index 636a3dc..7ef6ff6 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -883,6 +883,9 @@ fn machine_configuration_script(config: &MachineConfig) -> String {
     script.push_str("echo 16384 > /proc/sys/net/ipv4/neigh/default/gc_thresh2\n");
     script.push_str("echo 32768 > /proc/sys/net/ipv4/neigh/default/gc_thresh3\n");
 
+    // tcp max orphan limit
+    script.push_str("echo 524288 > /proc/sys/net/ipv4/tcp_max_orphans\n");
+
     // ip configuration
     script.push_str("cat << EOF | ip -b -\n");
     for command in config.ip_commands.iter() {