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Tinc FAQ

openrc​

sudo curl -o /etc/init.d/tinc.netname --create-file-mode 0755 -L https://github.com/wenerme/wener/blob/master/notes/service/network/vpn/tinc/tinc.openrc.sh

Could not create a tun/tap interface from /dev/net/tun: Resource busy​

MTU 1518​

tincd -n <netname> -kUSR2, and it will send a list of nodes to the syslog. The MTU should be in it.

There is no MTU limitation for a node talking to itself. So tinc just lists the maximum it itself supports, which is 1518.

https://github.com/opnsense/core/issues/2057 https://www.tinc-vpn.org/pipermail/tinc/2015-May/004142.html

Peer had unknown identity​

Peer 1.2.3.4 port 53291 had unknown identity (node_1)
Error while processing ID from node_1 (1.2.3.4 port 53291)

Error while decrypting routines:EVP_EncryptUpdate:invalid operation​

Error while decrypting: error:060A7094:digital envelope routines:EVP_EncryptUpdate:invalid operation
Error while decrypting metadata from node_1 (1.2.3.4 port 39080)

Handshake phase not finished yet​

  • 尝试 ExperimentalProtocol = no
  • 参考
    • #203 - too many "Invalid packet seqno" in logs

关联错误信息

Handshake phase not finished yet from master_1 (192.168.1.2 port 655)
No key from master_1 after 10 seconds, restarting SPTPS
Got REQ_KEY from master_1 while we already started a SPTPS session!
Invalid packet seqno: 0 != 1 from master_1 (192.168.1.2 port 655)
Failed to decrypt and verify packet from master_1 (192.168.1.2 port 655)

网络卡顿，大包丢失​

  • 避免使用 Port=0, 即便不能对外暴露端口，稳定的端口会让 tinc 组网更稳定。
  • 尽量对外暴露固定端口，nat 会更加通畅，更容易直连
  • 配置 Address 让本地更容易发现
  • 使用 iperf3 预热一下网络 - 看网络是否会变平稳

ping -s 1389 可以, 1390 不可以​

在 tinc 一段时间未使用后, ping -s 1389 可通, 但大的请求会卡顿。

ping -s 1389 实际发送 1397+20=1417

  • Use a smarter algorithm for choosing MTU discovery probe sizes
    • 初始 mtu 发现 - 8 次 probe
    • 1339, 1417 ~1450
    • minmtu + powf(interval, multiplier * cycle_position / (probes_per_cycle - 1))
      • multiplier = 0.982
      • cycle_position = probes_per_cycle - (n->mtuprobes % probes_per_cycle) - 1
      • minmtu 最小 64
      • interval = maxmtu - minmtu

PMTU - Path MTU​

服务配置

PingInterval=60
PingTimeout=5

主机配置

# 节点初始路径 MTU - Path MTU
PMTU = 1514
# 自动发现到节点的 Path MTU
PMTUDiscovery = yes
# 发送发现 MTU 消息的间隔
MTUInfoInterval = 5

Simple Peer-to-Peer Security - sptps​

  • 基于 TLS 1.2 进行精简
    • 没有 PKI - 交换公钥
    • 没有 cipher suite 协商
  • 节点认证使用 521 bits ECC keys, Diffie-Hellman using ephemeral 521 bits ECC keys is used to provide perfect forward secrecy (PFS), AES-256-CTR is used for encryption, and HMAC-SHA-256 for message authentication.
  • Simple Peer-to-Peer Security

tinc 1.0 vs tinc 1.1​

  • 1.0
    • 稳定
    • rsa
  • 1.1
    • 新的实验协议
    • tinc 命令
    • use of a GCM cipher suite to reduce the cost of HMAC
    • 使用 ECDSA 性能可能下降一半
    • 可通过 sptps_speed 测试协议吞吐性能
    • Ed25519 认证
    • ChaCha20-Poly1305 加密通讯
    • 支持 AES-GCM-256
    • 支持 IPv6
    • LAN 节点发现
    • Multiple routing modes
# 1.1
cd src
make sptps_speed
./sptps_speed

Intel Pentium G4560 (4) @ 3.500G

Generating keys for 10 seconds:          22600.52 op/s
Ed25519 sign for 10 seconds:             22027.18 op/s
Ed25519 verify for 10 seconds:            8444.55 op/s
ECDH for 10 seconds:                      6231.71 op/s
SPTPS/TCP authenticate for 10 seconds:    2923.57 op/s
SPTPS/TCP transmit for 10 seconds:           2.14 Gbit/s
SPTPS/UDP authenticate for 10 seconds:    2973.93 op/s
SPTPS/UDP transmit for 10 seconds:           2.17 Gbit/s

macOS Router tinc-up​

  • DeviceType = utun
ifconfig $INTERFACE 10.66.1.2 10.66.1.1 up
route add -net 10.66.1 -interface $INTERFACE

tun Destination address required​

  • tun 是 p2p 协议
ifconfig tun0 inet 10.0.0.1 10.0.0.2 up # A
ifconfig tun0 inet 10.0.0.2 10.0.0.1 up # B