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Operating Systems Linux Slackware Slackware router problem
# 1  
Old 08-01-2010
Slackware router problem
I have a Slackware box that I've set up as a router for my home network. It does that and zoneminder and that's pretty much it. It's worked fine for a few years doing this until today.

Today the power went out and the UPS could only keep this machine up for about 45 mins before it ran out of power. When the power came back up the I turned on the slackware box and it booted normally. Everything started up fine but one problem.

I have 4 other machines in the house that connect to the internet. None of them will pull up a web page. They will however ping and resolve anything on the outside world without a problem. My slackware box will load websites without a problem but anything on the internal network will not bring up a web page even though all of it can talk to the outside world. I know the problem is with this slackware box routing the web pages because my laptop and phone will both connect to my neighbor's internet and work fine.

It's like it's trying to work, I can ping websites so I know the machines on my internal network can not only see the outside world they can resolve domain names. It just won't let anything on the internal network fetch web pages.

I'm running slackware 13 and it's you basic dnsmasq setup with two lan cards. eth0 going to the cable modem and eth1 going to my switch.

I don't understand what could have changed. I suspect it's iptables that's changed some how. here's my output for iptables.

Code:
Chain INPUT (policy DROP 39 packets, 1686 bytes)
 pkts bytes target     prot opt in     out     source               destination 
39931   77M ACCEPT     all  --  lo     any     anywhere             anywhere    
 807K   38M bad_packets  all  --  any    any     anywhere             anywhere  
   94  2632 DROP       all  --  any    any     anywhere             ALL-SYSTEMS.MCAST.NET
 790K   32M ACCEPT     all  --  eth1   any     192.168.1.0/24       anywhere    
    0     0 ACCEPT     all  --  eth1   any     anywhere             192.168.1.255
12796 4925K ACCEPT     all  --  eth0   any     anywhere             anywhere            state RELATED,ESTABLISHED
   44  1896 tcp_inbound  tcp  --  eth0   any     anywhere             anywhere  
 4137 1337K udp_inbound  udp  --  eth0   any     anywhere             anywhere  
    0     0 icmp_packets  icmp --  eth0   any     anywhere             anywhere 
    0     0 DROP       all  --  any    any     anywhere             anywhere            PKTTYPE = broadcast
   39  1686 LOG        all  --  any    any     anywhere             anywhere            limit: avg 3/min burst 3 LOG level warning prefix `INPUT packet died: '

Chain FORWARD (policy DROP 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination 
 3930  419K bad_packets  all  --  any    any     anywhere             anywhere  
  425 46970 tcp_outbound  tcp  --  eth1   any     anywhere             anywhere 
 1682  124K udp_outbound  udp  --  eth1   any     anywhere             anywhere 
    4   240 ACCEPT     all  --  eth1   any     anywhere             anywhere    
 1788  246K ACCEPT     all  --  eth0   any     anywhere             anywhere            state RELATED,ESTABLISHED
    0     0 LOG        all  --  any    any     anywhere             anywhere            limit: avg 3/min burst 3 LOG level warning prefix `FORWARD packet died: '

Chain OUTPUT (policy DROP 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination 
    0     0 DROP       icmp --  any    any     anywhere             anywhere            state INVALID
  173 15642 ACCEPT     all  --  any    any     localhost            anywhere    
39758   77M ACCEPT     all  --  any    lo      anywhere             anywhere    
  214 33523 ACCEPT     all  --  any    any     192.168.1.1          anywhere    
 585K 1763M ACCEPT     all  --  any    eth1    anywhere             anywhere    
10988 1544K ACCEPT     all  --  any    eth0    anywhere             anywhere    
    0     0 LOG        all  --  any    any     anywhere             anywhere            limit: avg 3/min burst 3 LOG level warning prefix `OUTPUT packet died: '

Chain bad_packets (2 references)
 pkts bytes target     prot opt in     out     source               destination 
    0     0 LOG        all  --  eth0   any     192.168.1.0/24       anywhere            LOG level warning prefix `Illegal source: '
    0     0 DROP       all  --  eth0   any     192.168.1.0/24       anywhere    
   32  1280 LOG        all  --  any    any     anywhere             anywhere            state INVALID LOG level warning prefix `Invalid packet: '
   32  1280 DROP       all  --  any    any     anywhere             anywhere            state INVALID
 802K   37M bad_tcp_packets  tcp  --  any    any     anywhere             anywhere
 811K   39M RETURN     all  --  any    any     anywhere             anywhere    

Chain bad_tcp_packets (1 references)
 pkts bytes target     prot opt in     out     source               destination 
 790K   32M RETURN     tcp  --  eth1   any     anywhere             anywhere    
    0     0 LOG        tcp  --  any    any     anywhere             anywhere            tcp flags:!FIN,SYN,RST,ACK/SYN state NEW LOG level warning prefix `New not syn: '
    0     0 DROP       tcp  --  any    any     anywhere             anywhere            tcp flags:!FIN,SYN,RST,ACK/SYN state NEW
    0     0 LOG        tcp  --  any    any     anywhere             anywhere            tcp flags:FIN,SYN,RST,PSH,ACK,URG/NONE LOG level warning prefix `Stealth scan: '
    0     0 DROP       tcp  --  any    any     anywhere             anywhere            tcp flags:FIN,SYN,RST,PSH,ACK,URG/NONE
    0     0 LOG        tcp  --  any    any     anywhere             anywhere            tcp flags:FIN,SYN,RST,PSH,ACK,URG/FIN,SYN,RST,PSH,ACK,URG LOG level warning prefix `Stealth scan: '
    0     0 DROP       tcp  --  any    any     anywhere             anywhere            tcp flags:FIN,SYN,RST,PSH,ACK,URG/FIN,SYN,RST,PSH,ACK,URG
    0     0 LOG        tcp  --  any    any     anywhere             anywhere            tcp flags:FIN,SYN,RST,PSH,ACK,URG/FIN,PSH,URG LOG level warning prefix `Stealth scan: '
    0     0 DROP       tcp  --  any    any     anywhere             anywhere            tcp flags:FIN,SYN,RST,PSH,ACK,URG/FIN,PSH,URG
    0     0 LOG        tcp  --  any    any     anywhere             anywhere            tcp flags:FIN,SYN,RST,PSH,ACK,URG/FIN,SYN,RST,ACK,URG LOG level warning prefix `Stealth scan: '
    0     0 DROP       tcp  --  any    any     anywhere             anywhere            tcp flags:FIN,SYN,RST,PSH,ACK,URG/FIN,SYN,RST,ACK,URG
    0     0 LOG        tcp  --  any    any     anywhere             anywhere            tcp flags:SYN,RST/SYN,RST LOG level warning prefix `Stealth scan: '
    0     0 DROP       tcp  --  any    any     anywhere             anywhere            tcp flags:SYN,RST/SYN,RST
    0     0 LOG        tcp  --  any    any     anywhere             anywhere            tcp flags:FIN,SYN/FIN,SYN LOG level warning prefix `Stealth scan: '
    0     0 DROP       tcp  --  any    any     anywhere             anywhere            tcp flags:FIN,SYN/FIN,SYN
12101 4778K RETURN     tcp  --  any    any     anywhere             anywhere    

Chain icmp_packets (1 references)
 pkts bytes target     prot opt in     out     source               destination 
    0     0 LOG        icmp -f  any    any     anywhere             anywhere            LOG level warning prefix `ICMP Fragment: '
    0     0 DROP       icmp -f  any    any     anywhere             anywhere    
    0     0 DROP       icmp --  any    any     anywhere             anywhere            icmp echo-request
    0     0 ACCEPT     icmp --  any    any     anywhere             anywhere            icmp time-exceeded
    0     0 RETURN     icmp --  any    any     anywhere             anywhere    

Chain tcp_inbound (1 references)
 pkts bytes target     prot opt in     out     source               destination 
    0     0 REJECT     tcp  --  any    any     anywhere             anywhere            tcp dpt:auth reject-with icmp-port-unreachable
    8   432 ACCEPT     tcp  --  any    any     anywhere             anywhere            tcp dpt:http
    3   144 ACCEPT     tcp  --  any    any     anywhere             anywhere            tcp dpt:smtp
    0     0 ACCEPT     tcp  --  any    any     anywhere             anywhere            tcp dpt:pop3
    0     0 ACCEPT     tcp  --  any    any     anywhere             anywhere            tcp dpt:imap
    0     0 ACCEPT     tcp  --  any    any     anywhere             anywhere            tcp dpt:ssh
    0     0 ACCEPT     tcp  --  any    any     anywhere             anywhere            tcp dpts:commplex-main:5100
    0     0 ACCEPT     tcp  --  any    any     anywhere             anywhere            tcp dpts:6891:6900
    0     0 ACCEPT     tcp  --  any    any     anywhere             anywhere            tcp dpt:auth
   33  1320 RETURN     tcp  --  any    any     anywhere             anywhere    

Chain tcp_outbound (1 references)
 pkts bytes target     prot opt in     out     source               destination 
  425 46970 ACCEPT     tcp  --  any    any     anywhere             anywhere    

Chain udp_inbound (1 references)
 pkts bytes target     prot opt in     out     source               destination 
   32  3000 DROP       udp  --  any    any     anywhere             anywhere            udp dpt:netbios-ns
   33  7701 DROP       udp  --  any    any     anywhere             anywhere            udp dpt:netbios-dgm
    0     0 REJECT     udp  --  any    any     anywhere             anywhere            udp dpt:auth reject-with icmp-port-unreachable
    0     0 ACCEPT     udp  --  any    any     anywhere             anywhere            udp dpt:domain
 4066 1326K ACCEPT     udp  --  any    any     anywhere             anywhere            udp spt:bootps dpt:bootpc
    6   366 RETURN     udp  --  any    any     anywhere             anywhere    

Chain udp_outbound (1 references)
 pkts bytes target     prot opt in     out     source               destination 
 1682  124K ACCEPT     udp  --  any    any     anywhere             anywhere

# 2  
Old 09-17-2010
What you get if you run "w3m www.google.com"?
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