当 UFW 默认拒绝传出时,ping 和 traceroute 不起作用

当 UFW 默认拒绝传出时,ping 和 traceroute 不起作用

deny outgoing默认设置 UFW 后如何使 ping 和 traceroute 工作?

这是我的 UFW 配置:

sudo ufw status verbose
Status: active
Logging: on (low)
Default: deny (incoming), deny (outgoing), disabled (routed)
New profiles: skip

To                         Action      From
--                         ------      ----
123/udp                    ALLOW IN    Anywhere
80/tcp                     ALLOW IN    Anywhere
443/tcp                    ALLOW IN    Anywhere
123/udp (v6)               ALLOW IN    Anywhere (v6)
80/tcp (v6)                ALLOW IN    Anywhere (v6)
443/tcp (v6)               ALLOW IN    Anywhere (v6)

53                         ALLOW OUT   Anywhere
80/tcp                     ALLOW OUT   Anywhere
443/tcp                    ALLOW OUT   Anywhere
587/tcp                    ALLOW OUT   Anywhere
123/udp                    ALLOW OUT   Anywhere
53 (v6)                    ALLOW OUT   Anywhere (v6)
80/tcp (v6)                ALLOW OUT   Anywhere (v6)
443/tcp (v6)               ALLOW OUT   Anywhere (v6)
587/tcp (v6)               ALLOW OUT   Anywhere (v6)
123/udp (v6)               ALLOW OUT   Anywhere (v6)

以下是 ping 和 traceroute 结果:

ping google.com
PING google.com (173.194.121.34) 56(84) bytes of data.
ping: sendmsg: Operation not permitted

traceroute google.com
traceroute to google.com (173.194.121.34), 30 hops max, 60 byte packets
send: Operation not permitted

我找到了这个帖子(http://www.kelvinism.com/2010/09/enable-icmp-through-ufw_461.html) 建议将这些行添加到/etc/ufw/before.rules

# allow outbound icmp
-A ufw-before-output -p icmp -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
-A ufw-before-output -p icmp -m state --state ESTABLISHED,RELATED -j ACCEPT

它似乎适用于 ping,但不适用于 traceroute。有什么想法吗?

谢谢

答案1

这对我有用:

ufw allow out to any port 33434:33524 proto udp

答案2

我必须使用 sudotraceroute-I选项 ( Use ICMP ECHO for tracerouting):

sudo traceroute google.com -I

答案3

对于 traceroute,您需要允许 33434:33524 范围内的传出 UDP 数据包。某些工具还允许您使用 ICMP 回显请求。由于 PING 正在运行,因此您必须启用 ICMP 回显请求数据包。

返回的数据包大部分是 ICMP 超时数据包。如果您已启用所需的 ICMP 类型,则无需配置任何内容。

答案4

建议您允许更广泛的 ICMP 响应。

-A ufw-before-input -p icmp --icmp-type destination-unreachable -j ACCEPT
-A ufw-before-input -p icmp --icmp-type source-quench -j ACCEPT
-A ufw-before-input -p icmp --icmp-type time-exceeded -j ACCEPT
-A ufw-before-input -p icmp --icmp-type parameter-problem -j ACCEPT
-A ufw-before-input -p icmp --icmp-type echo-request -j ACCEPT

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