Ocserv

ocserv是一套支援Cisco AnyConnect協定的VPN伺服器軟體。

安裝

sudo apt install -y ocserv; sudo apt clean

設定

在/etc/oserv/ocserv.conf內設定：

#
auth = "pam"
tcp-port = 8443
udp-port = 8443
run-as-user = nobody
run-as-group = daemon
socket-file = /var/run/ocserv-socket
server-cert = /etc/dehydrated/certs/vpn.example.com/fullchain.pem
server-key = /etc/dehydrated/certs/vpn.example.com/privkey.pem
ca-cert = /etc/ssl/certs/ca-certificates.crt
isolate-workers = true
max-clients = 240
max-same-clients = 32
keepalive = 32400
dpd = 90
mobile-dpd = 1800
try-mtu-discovery = false
cert-user-oid = 0.9.2342.19200300.100.1.1
tls-priorities = "NORMAL:%SERVER_PRECEDENCE:%COMPAT:-VERS-SSL3.0"
auth-timeout = 240
min-reauth-time = 3
max-ban-score = 50
ban-reset-time = 300
cookie-timeout = 300
deny-roaming = false
rekey-time = 172800
rekey-method = ssl
use-utmp = true
use-occtl = true
pid-file = /var/run/ocserv.pid
device = vpns
predictable-ips = true
default-domain = example.com
ipv4-network = 192.168.254.0
ipv4-netmask = 255.255.255.0
ipv6-network = fda9:4efe:7e3b:03ea::/48
dns = 8.8.8.8
split-dns = example.com
split-dns = example.net
ping-leases = false
route = 10.0.0.0/8
cisco-client-compat = true
dtls-legacy = true

另外，Ubuntu預設的systemd設定會使得DTLS（UDP）無法使用，只能使用TLS（TCP）而導致傳輸效率不佳，所以要修正：

sudo sed -i -E -e 's/^(Requires=ocserv.socket)/#\1/' -e 's/^(Also=ocserv.socket)/#\1/' /lib/systemd/system/ocserv.service; sudo systemctl stop ocserv; sudo systemctl disable ocserv.service; sudo systemctl disable ocserv.socket; sudo systemctl daemon-reload; sudo systemctl start ocserv; sudo systemctl enable ocserv

外部連結

• 官方網站 （英文）