This is about a clearOS installation.
eth0 = external interface (dhcp Internet) eth1 = internal lan, static 192.168.0.10 eth2 = dmz
The problem is, after initial installation, I was able to connect to external (Internet) without too much trouble, but local network usage (ie browsing) was initially all "closed", I could ping the machines but browsing was not possible.
Enabling the web proxy fixed this, except for https pages. Https pages are blocked, they all time-out when on the network.
Being from a progrmming background, I am not all that familiar with iptables-lingo, this is beyond my grasp but any tip or helpful directions to a helpful example similar to what I need to do will be greatly appreciated. Route and iptables --list output provided below.
route :
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.0.0 * 255.255.255.0 U 0 0 0 eth1
192.168.0.0 * 255.255.255.0 U 0 0 0 eth2
96.22.88.0 * 255.255.255.0 U 0 0 0 eth0
default modemcable001.8 0.0.0.0 UG 0 0 0 eth0
iptables:
[root@alcastraz ~]# iptables --list -n -v
Chain INPUT (policy DROP 290 packets, 12072 bytes)
pkts bytes target prot opt in out source destination
2 84 DROP all -- * * 0.0.0.0/0 0.0.0.0/0 state INVALID
0 0 REJECT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp flags:0x12/0x12 state NEW reject-with tcp-reset
0 0 DROP tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp flags:!0x17/0x02 state NEW
0 0 DROP all -- eth0 * 127.0.0.0/8 0.0.0.0/0
0 0 DROP all -- eth0 * 169.254.0.0/16 0.0.0.0/0
4473 1190K ACCEPT all -- lo * 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT all -- pptp+ * 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT all -- tun+ * 0.0.0.0/0 0.0.0.0/0
10200 2469K ACCEPT all -- eth1 * 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT udp -- eth2 * 0.0.0.0/0 192.168.0.50 udp spt:68 dpt:67
0 0 ACCEPT tcp -- eth2 * 0.0.0.0/0 192.168.0.50 tcp spt:68 dpt:67
0 0 ACCEPT udp -- eth2 * 192.168.0.0/24 192.168.0.50 udp dpt:53
0 0 ACCEPT tcp -- eth2 * 192.168.0.0/24 192.168.0.50 tcp dpt:53
56 1624 ACCEPT icmp -- eth0 * 0.0.0.0/0 0.0.0.0/0 icmp type 0
0 0 ACCEPT icmp -- eth0 * 0.0.0.0/0 0.0.0.0/0 icmp type 3
1 28 ACCEPT icmp -- eth0 * 0.0.0.0/0 0.0.0.0/0 icmp type 8
0 0 ACCEPT icmp -- eth0 * 0.0.0.0/0 0.0.0.0/0 icmp type 11
25 8189 ACCEPT udp -- eth0 * 0.0.0.0/0 0.0.0.0/0 udp spt:67 dpt:68
0 0 ACCEPT tcp -- eth0 * 0.0.0.0/0 0.0.0.0/0 tcp spt:67 dpt:68
0 0 ACCEPT tcp -- * * 0.0.0.0/0 192.168.0.50 tcp dpt:80
0 0 ACCEPT tcp -- * * 0.0.0.0/0 96.22.88.25 tcp dpt:80
0 0 ACCEPT tcp -- * * 0.0.0.0/0 192.168.0.50 tcp dpt:443
0 0 ACCEPT tcp -- * * 0.0.0.0/0 96.22.88.25 tcp dpt:443
0 0 ACCEPT tcp -- * * 0.0.0.0/0 192.168.0.50 tcp dpt:1875
0 0 ACCEPT tcp -- * * 0.0.0.0/0 96.22.88.25 tcp dpt:1875
0 0 ACCEPT udp -- eth2 * 0.0.0.0/0 0.0.0.0/0 udp dpts:1024:65535 state RELATED,ESTABLISHED
0 0 ACCEPT tcp -- eth2 * 0.0.0.0/0 0.0.0.0/0 tcp dpts:1024:65535 state RELATED,ESTABLISHED
434 56568 ACCEPT udp -- eth0 * 0.0.0.0/0 0.0.0.0/0 udp dpts:1024:65535 state RELATED,ESTABLISHED
10241 11M ACCEPT tcp -- eth0 * 0.0.0.0/0 0.0.0.0/0 tcp dpts:1024:65535 state RELATED,ESTABLISHED
Chain FORWARD (policy DROP 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
0 0 ACCEPT icmp -- * * 192.168.0.0/24 0.0.0.0/0 icmp type 0
0 0 ACCEPT icmp -- * * 0.0.0.0/0 192.168.0.0/24 icmp type 0
0 0 ACCEPT icmp -- * * 192.168.0.0/24 0.0.0.0/0 icmp type 3
0 0 ACCEPT icmp -- * * 0.0.0.0/0 192.168.0.0/24 icmp type 3
1 84 ACCEPT icmp -- * * 192.168.0.0/24 0.0.0.0/0 icmp type 8
0 0 ACCEPT icmp -- * * 0.0.0.0/0 192.168.0.0/24 icmp type 8
0 0 ACCEPT icmp -- * * 192.168.0.0/24 0.0.0.0/0 icmp type 11
0 0 ACCEPT icmp -- * * 0.0.0.0/0 192.168.0.0/24 icmp type 11
0 0 DROP icmp -- * * 192.168.0.0/24 0.0.0.0/0
0 0 DROP icmp -- * * 0.0.0.0/0 192.168.0.0/24
0 0 ACCEPT all -- * * 192.168.0.0/24 192.168.0.0/24 state RELATED,ESTABLISHED
0 0 DROP all -- * * 192.168.0.0/24 192.168.0.0/24
0 0 ACCEPT all -- * * 192.168.0.0/24 192.168.0.0/24
0 0 ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
0 0 ACCEPT all -- eth2 * 0.0.0.0/0 0.0.0.0/0
189 9468 ACCEPT all -- eth1 * 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT all -- pptp+ * 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT all -- tun+ * 0.0.0.0/0 0.0.0.0/0
Chain OUTPUT (policy DROP 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
4473 1190K ACCEPT all -- * lo 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT all -- * pptp+ 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT all -- * tun+ 0.0.0.0/0 0.0.0.0/0
13828 13M ACCEPT all -- * eth1 0.0.0.0/0 0.0.0.0/0
57 1652 ACCEPT icmp -- * eth0 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT udp -- * eth0 0.0.0.0/0 0.0.0.0/0 udp spt:68 dpt:67
0 0 ACCEPT tcp -- * eth0 0.0.0.0/0 0.0.0.0/0 tcp spt:68 dpt:67
0 0 ACCEPT tcp -- * eth2 192.168.0.50 0.0.0.0/0 tcp spt:80
0 0 ACCEPT tcp -- * eth0 96.24.88.26 0.0.0.0/0 tcp spt:80
0 0 ACCEPT tcp -- * eth2 192.168.0.50 0.0.0.0/0 tcp spt:443
0 0 ACCEPT tcp -- * eth0 96.24.88.26 0.0.0.0/0 tcp spt:443
0 0 ACCEPT tcp -- * eth2 192.168.0.50 0.0.0.0/0 tcp spt:1875
0 0 ACCEPT tcp -- * eth0 96.24.88.26 0.0.0.0/0 tcp spt:1875
0 0 ACCEPT all -- * eth2 0.0.0.0/0 0.0.0.0/0
9125 2383K ACCEPT all -- * eth0 0.0.0.0/0 0.0.0.0/0
Chain drop-lan (0 references)
pkts bytes target prot opt in out source destination
0 0 DROP all -- * * 0.0.0.0/0 0.0.0.0/0
Thanks!
[UPDATE] Updated output of iptable, added parameters -v -n. https pages are now working, though only when client is configured to use the web-proxy, this is a re-install and I am perplexed as to how the web clients could access Internet proxi-less before the re-install. Though this routing everything through the proxy may make sense somewhat in a work environnement, I feel it may be overkill for my home network where the biggest threat is my dog romping through the cables.
Based on the fact that only HTTP and HTTPS access work when using the proxy, it seems that clearOS is not actually routing any packets for the clients. This is usually caused by the
FORWARDchain dropping the packets (which looks fine from the above output), or IP forwarding being disabled (cat /proc/sys/net/ipv4/ip_forwardshould output1), or NAT not being applied (i.e.MASQUERADErules in thePOSTROUTINGchain of thenattable).