我有一个linux系统,需要在其上配置防火墙。不幸的是,在我设置防火墙后,扫描网络中的打印机不起作用(没有防火墙,就可以看到打印机)。
使用的打印机 - lpinfo -l -v
Device: uri = socket://xx.xx.xx.xx:9100
class = network
info = Deskjet 3520 e-All-in-One Printer series
make-and-model = HP Deskjet 3520 series
device-id = MFG:HP;MDL:Deskjet 3520 series;
location =
下面您可以看到我正在使用的规则,这些规则是根据我在以下位置找到的信息构建的:https://www.cups.org/doc/firewalls.html:
iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT DROP
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -p udp --dport 53 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -p tcp --dport 53 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A INPUT -p tcp --dport 631 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -p tcp --dport 631 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A INPUT -p udp --dport 5353 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -p udp --dport 5353 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -p tcp --dport 443 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -p tcp --dport 161 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -p tcp --dport 515 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -p tcp --dport 9100 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -nvL
Chain INPUT (policy DROP 8 packets, 788 bytes)
pkts bytes target prot opt in out source destination
0 0 ACCEPT all -- lo * 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:22
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:631 state NEW
0 0 ACCEPT udp -- * * 0.0.0.0/0 0.0.0.0/0 udp dpt:631 state NEW
23 4228 ACCEPT udp -- * * 0.0.0.0/0 0.0.0.0/0 udp dpt:5353 state NEW
0 0 ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
Chain FORWARD (policy DROP 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
Chain OUTPUT (policy DROP 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
22 3619 ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 state NEW,RELATED,ESTABLISHED
0 0 ACCEPT udp -- * * 0.0.0.0/0 0.0.0.0/0 state NEW,ESTABLISHED udp dpt:137
0 0 ACCEPT udp -- * * 0.0.0.0/0 0.0.0.0/0 state NEW,ESTABLISHED udp dpt:138
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 state NEW,ESTABLISHED tcp dpt:139
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 state NEW,ESTABLISHED tcp dpt:445
你知道我错过了什么吗?谢谢
答案1
使用 iptables 日志记录(按照@notsoslimshady 的建议)我能够看到我之前丢失的内容。现在发现该打印机是网络打印机。
iptables -A INPUT -p tcp --dport 631 -j ACCEPT
iptables -A INPUT -p udp --dport 631 -j ACCEPT
iptables -A OUTPUT -p udp --dport 161 -j ACCEPT
**iptables -A INPUT -p udp --sport 161 -j ACCEPT** <-- Missing rule