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Първоначално написано от лтрифонов
Порт не може просто така да се отвори или затвори. За да е "отворен" порт, трябва:
1. Да има някаква услуга която работи на този порт (например oscam)
2. защитната стена да разрешава входящ трафик към този порт.
как се проверява 1:
netstat -na | grep 40000 (за проверка дали се очакват входящи към порт 40000) Ако наистина нещо чака на порт 40000 ще се изпише това:
Код:
netstat -na | grep 40000
tcp 0 0 0.0.0.0:40000 0.0.0.0:* LISTEN
tcp 0 0 192.168.3.33:40000 192.168.3.38:4149 ESTABLISHED
горното показва че се слуша на TCP порт 40000 на всички интерфейси (0.0.0.0), а при теб как е?
ако наистина има процес, порта се слуша, но ти не може да направиш връзка, значи ти пречи защитната стена.
Дай малко повече инфо за нея:
изпълни: iptables -v -L -n и покажи какво връща.
Следващо нещо: от локалната мрежа ли искаш да се закачиш към този порт или от интернет? |
Ето това ми показа:
root@DD-WRT:~# netstat -na | grep 12000
tcp 0 0 192.168.1.1:12000 192.168.1.125:60170 TIME_WAIT
tcp 0 0 192.168.1.1:41010 192.168.1.111:12000 TIME_WAIT
след което оскама заби. Нещо не се разбират , а преди това в локална мрежа си работеше.
А след това и другата команда:
root@DD-WRT:~# iptables -v -L -n
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
1132 110K ACCEPT 0 -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
0 0 DROP udp -- ppp0 * 0.0.0.0/0 0.0.0.0/0 udp dpt:520
0 0 DROP udp -- br0 * 0.0.0.0/0 0.0.0.0/0 udp dpt:520
0 0 ACCEPT udp -- * * 0.0.0.0/0 0.0.0.0/0 udp dpt:520
3 477 DROP icmp -- ppp0 * 0.0.0.0/0 0.0.0.0/0
0 0 DROP 2 -- * * 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT udp -- ppp0 * 0.0.0.0/0 0.0.0.0/0 udp dpt:5060
0 0 ACCEPT 0 -- lo * 0.0.0.0/0 0.0.0.0/0 state NEW
1167 94062 logaccept 0 -- br0 * 0.0.0.0/0 0.0.0.0/0 state NEW
313 20333 DROP 0 -- * * 0.0.0.0/0 0.0.0.0/0
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
0 0 ACCEPT 0 -- br0 br0 0.0.0.0/0 0.0.0.0/0
4715 283K TCPMSS tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp flags:0x06/0x02 TCPMSS clamp to PMTU
33632 2203K lan2wan 0 -- * * 0.0.0.0/0 0.0.0.0/0
31119 2037K ACCEPT 0 -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
0 0 DROP tcp -- * ppp0 0.0.0.0/0 0.0.0.0/0 tcp dpt:1723
0 0 DROP udp -- * ppp0 0.0.0.0/0 0.0.0.0/0 udp dpt:1701
0 0 DROP udp -- * ppp0 0.0.0.0/0 0.0.0.0/0 udp dpt:500
0 0 TRIGGER 0 -- ppp0 br0 0.0.0.0/0 0.0.0.0/0 TRIGGER type:in match:0 relate:0
2513 166K trigger_out 0 -- br0 * 0.0.0.0/0 0.0.0.0/0
2498 165K ACCEPT 0 -- br0 * 0.0.0.0/0 0.0.0.0/0 state NEW
15 660 DROP 0 -- * * 0.0.0.0/0 0.0.0.0/0
Chain OUTPUT (policy ACCEPT 2244 packets, 617K bytes)
pkts bytes target prot opt in out source destination
Chain advgrp_1 (0 references)
pkts bytes target prot opt in out source destination
Chain advgrp_10 (0 references)
pkts bytes target prot opt in out source destination
Chain advgrp_2 (0 references)
pkts bytes target prot opt in out source destination
Chain advgrp_3 (0 references)
pkts bytes target prot opt in out source destination
Chain advgrp_4 (0 references)
pkts bytes target prot opt in out source destination
Chain advgrp_5 (0 references)
pkts bytes target prot opt in out source destination
Chain advgrp_6 (0 references)
pkts bytes target prot opt in out source destination
Chain advgrp_7 (0 references)
pkts bytes target prot opt in out source destination
Chain advgrp_8 (0 references)
pkts bytes target prot opt in out source destination
Chain advgrp_9 (0 references)
pkts bytes target prot opt in out source destination
Chain grp_1 (1 references)
pkts bytes target prot opt in out source destination
Chain grp_10 (0 references)
pkts bytes target prot opt in out source destination
Chain grp_2 (0 references)
pkts bytes target prot opt in out source destination
Chain grp_3 (0 references)
pkts bytes target prot opt in out source destination
Chain grp_4 (0 references)
pkts bytes target prot opt in out source destination
Chain grp_5 (0 references)
pkts bytes target prot opt in out source destination
Chain grp_6 (0 references)
pkts bytes target prot opt in out source destination
Chain grp_7 (0 references)
pkts bytes target prot opt in out source destination
Chain grp_8 (0 references)
pkts bytes target prot opt in out source destination
Chain grp_9 (0 references)
pkts bytes target prot opt in out source destination
Chain lan2wan (1 references)
pkts bytes target prot opt in out source destination
33632 2203K grp_1 0 -- * * 0.0.0.0/0 0.0.0.0/0
Chain logaccept (1 references)
pkts bytes target prot opt in out source destination
1167 94062 ACCEPT 0 -- * * 0.0.0.0/0 0.0.0.0/0
Chain logdrop (0 references)
pkts bytes target prot opt in out source destination
0 0 DROP 0 -- * * 0.0.0.0/0 0.0.0.0/0
Chain logreject (0 references)
pkts bytes target prot opt in out source destination
0 0 REJECT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp reject-with tcp-reset
Chain trigger_out (1 references)
pkts bytes target prot opt in out source destination
root@DD-WRT:~#