我的vps防火墙挡住了wget,curl,连yum update都会超时。
主机是Vultr的,不像阿里云,Vultr没有面板可以管理网络,应该全靠本机防火墙。
但ping命令没有问题,安装的网络转发服务,go语言的ss manyuser也没问题。
关闭防火墙即可正常下载,开启防火墙后wget会超时。
--2017-01-28 08:46:06-- (try: 2) http://dldir1.qq.com/qqfile/qq/QQ8.9/19990/QQ8.9.exe
Connecting to dldir1.qq.com|174.35.24.138|:80... failed: Connection timed out.
Connecting to dldir1.qq.com|174.35.25.7|:80... failed: Connection timed out.
Retrying.
我按照教程重新该配置了规则,已删掉楼下朋友说的drop all条目。input的最后一条记录应该就是把drop掉的数据记录下来。
[root@www ~]# iptables -L
Chain INPUT (policy DROP)
target prot opt source destination
ACCEPT tcp -- anywhere anywhere tcp dpt:20160
ACCEPT tcp -- anywhere anywhere tcp dpts:50001:50100
ACCEPT tcp -- anywhere anywhere tcp dpts:11024:11120
ACCEPT icmp -- anywhere anywhere icmp any
ACCEPT all -- localhost localhost
ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED
ACCEPT tcp -- anywhere anywhere tcp dpt:http
ACCEPT tcp -- anywhere anywhere tcp dpt:https
ACCEPT all -- anywhere anywhere ctstate RELATED,ESTABLISHED
ACCEPT tcp -- 一个ip anywhere
LOG all -- anywhere anywhere limit: avg 10/sec burst 5 LOG level warning
Chain FORWARD (policy ACCEPT)
target prot opt source destination
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
运行wget后,查看防火墙日志/var/log/messages
会出现这个。同时还有很多访问80和443的记录。也不知道他们访问成功了没有。我自己测试访问80端口没问题。
Jan 28 08:44:06 www kernel: IN=eth0 OUT= MAC= SRC=174.35.24.138 DST=我的ip LEN=44 TOS=0x00 PREC=0x00 TTL=60 ID=0 DF PROTO=TCP SPT=80 DPT=47754 WINDOW=65535 RES=0x00 ACK SYN URGP=0
TCP三次握手是我发一个syn,对方发一个syn ack,我再发一个ack回去。这里似乎是把对方发的ack syn挡住了,求各位指点。
系统版本:
[root@www ~]# cat /proc/version
Linux version 2.6.32-573.22.1.el6.x86_64 (mockbuild@c6b8.bsys.dev.centos.org) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-16) (GCC) ) #1 SMP Wed Mar 23 03:35:39 UTC 2016
[root@www ~]# uname -a
Linux 2.6.32-573.22.1.el6.x86_64 #1 SMP Wed Mar 23 03:35:39 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
[root@www ~]# cat /etc/issue
CentOS release 6.8 (Final)
Kernel \r on an \m
[root@www ~]# cat /etc/redhat-release
CentOS release 6.8 (Final)
[root@www ~]# iptables --version
iptables v1.4.7
Pada asalnya ia adalah Centos 64-bit, tetapi tiada masalah apabila ia ditukar kepada 32-bit. Ia mungkin masalah dengan imej pembekal perkhidmatan vps itu sendiri.
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