StrongSwan IPsec VPN slow connection speed on Manjaro Linux(Arch)

Question

On Manjaro Linux (arch), the speed of connecting to corporate resources under vpn (ipsec) dropped to almost 0, but everything was fine before I have already tried different configurations, but nothing helped. At the same time, vpn works fine on Android and there are no such problems

ipsec.conf:

config setup
    # strictcrlpolicy=yes
    # uniqueids = no
 
conn NAME
    dpdaction=restart
    dpddelay=30
    dpdtimeout=90
    fragmentation=yes
    leftsourceip=%config
    keyexchange=ikev2
    eap_identity=***
    leftauth=eap-mschapv2
    rightauth=pubkey
    right=***
    rightsubnet=***
    auto=add

/etc/strongswan.conf:

charon {
    threads = 10240
    #load_modular = yes
    plugins {
        include strongswan.d/charon/*.conf
    }
}

include strongswan.d/*.conf

Answer 1

Ok, this solution helped me I reduced the MTU and everything returned to normal.

https://bbs.archlinux.org/viewtopic.php?id=244606

I find the issue ! It was related to MTU.

sudo ip link set dev wlp3s0 mtu 1328