Re: Networking problem

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On 05/14/11 09:17, Rick Sewill wrote:
> On Saturday, May 14, 2011 09:27:55 AM JD wrote:
>> On 05/14/11 08:48, G.Wolfe Woodbury wrote:
>>> On 05/14/2011 09:36 AM, JD wrote:
>>>> On my F14, I am running a firewall that accepts specific connection on
>>>> specific ports from some machines on the LAN.
>>>>
>>>> However, for one machine I made a general rule to accept all
>>>> connections:
>>>>
>>>> -A INPUT -s 192.168.1.60 -j ACCEPT
>>>>
>>>> After restarting the firewall,
>>>>
>>>> I still am unable to ping that machine and it is unable to ping me.
>>>> That machine is not running a firewall.
>>>>
>>>> I can ping the router and another machine I have on the LAN.
>>>> The machine at 192.168.1.60 can do the same.
>>>>
>>>> What else do I need to do to be able to talk to machine 192.168.1.60
>>>> and it to my fedora machine?
>>> Try:
>>>
>>> -A INPUT -s 192.168.1.60/32 -j ACCEPT
>>>
>>> there needs to be a netmask in the syntax.
>> Tried it.
>> Did not change anything :(
> Could we see more of the network topology please?
>
> Can you do on both machines:
> /bin/netstat -rn
On Fedora Machine:
# /bin/netstat -rn
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt 
Iface
10.0.0.0        0.0.0.0         255.255.255.0   U         0 0          0 
eth0
192.168.1.0     0.0.0.0         255.255.255.0   U         0 0          0 
wlan0
10.1.1.0        0.0.0.0         255.255.255.0   U         0 0          0 
eth0
192.168.122.0   0.0.0.0         255.255.255.0   U         0 0          0 
virbr0
0.0.0.0         192.168.1.254   0.0.0.0         UG        0 0          0 
wlan0


On the machine in question (192.168.1.60)
# /sbin/netstat -rn
Routing tables

Internet:
Destination        Gateway            Flags    Refs      Use  Netif Expire
default            192.168.1.254      UGSc        8        0    en1
127                127.0.0.1          UCS         0        0    lo0
127.0.0.1          127.0.0.1          UH          0        4    lo0
169.254            link#6             UCS         0        0    en1
192.168.1          link#6             UCS         2        0    en1
192.168.1.1        0:26:18:6:ef:7     UHLW        0      113    en1    566
192.168.1.60       127.0.0.1          UHS         0        0    lo0
192.168.1.254      0:1d:5a:c8:91:c1   UHLW       15      153    en1    565

Internet6:
Destination                             Gateway                         
Flags      Netif Expire
::1                                     link#1                          
UHL         lo0
fe80::%lo0/64                           fe80::1%lo0                     
Uc          lo0
fe80::1%lo0                             link#1                          
UHL         lo0
ff01::/32                               ::1                             
U           lo0
ff02::/32                               fe80::1%lo0                     
UC          lo0


>
> /sbin/ifconfig
On Fedora machine:

# /sbin/ifconfig
eth0      Link encap:Ethernet  HWaddr 00:03:0D:15:2B:9E
           inet addr:10.1.1.1  Bcast:10.1.1.255  Mask:255.255.255.0
           inet6 addr: fe80::203:dff:fe15:2b9e/64 Scope:Link
           UP BROADCAST MULTICAST  MTU:1500  Metric:1
           RX packets:1340 errors:0 dropped:0 overruns:0 frame:0
           TX packets:849 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:1000
           RX bytes:174589 (170.4 KiB)  TX bytes:418153 (408.3 KiB)
           Interrupt:19 Base address:0xd800

eth0:0    Link encap:Ethernet  HWaddr 00:03:0D:15:2B:9E
           inet addr:10.0.0.1  Bcast:10.0.0.255  Mask:255.255.255.0
           UP BROADCAST MULTICAST  MTU:1500  Metric:1
           Interrupt:19 Base address:0xd800

lo        Link encap:Local Loopback
           inet addr:127.0.0.1  Mask:255.0.0.0
           inet6 addr: ::1/128 Scope:Host
           UP LOOPBACK RUNNING  MTU:16436  Metric:1
           RX packets:4734603 errors:0 dropped:0 overruns:0 frame:0
           TX packets:4734603 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:0
           RX bytes:373719874 (356.4 MiB)  TX bytes:373719874 (356.4 MiB)

virbr0    Link encap:Ethernet  HWaddr 22:3E:A6:BB:CD:51
           inet addr:192.168.122.1  Bcast:192.168.122.255  
Mask:255.255.255.0
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
           TX packets:8391 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:0
           RX bytes:0 (0.0 b)  TX bytes:1617830 (1.5 MiB)

wlan0     Link encap:Ethernet  HWaddr 00:34:56:00:03:43
           inet6 addr: fe80::234:56ff:fe00:343/64 Scope:Link
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           RX packets:4976669 errors:0 dropped:0 overruns:0 frame:0
           TX packets:4947232 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:1000
           RX bytes:1062494718 (1013.2 MiB)  TX bytes:500756007 (477.5 MiB)

wlan0:0   Link encap:Ethernet  HWaddr 00:34:56:00:03:43
           inet addr:192.168.1.108  Bcast:192.168.1.255  Mask:255.255.255.0
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

On 192.168.1.60:
# /sbin/ifconfig
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
     inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1
     inet 127.0.0.1 netmask 0xff000000
     inet6 ::1 prefixlen 128
gif0: flags=8010<POINTOPOINT,MULTICAST> mtu 1280
stf0: flags=0<> mtu 1280
en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
     ether 00:11:24:7e:2d:c8
     media: autoselect (none) status: inactive
     supported media: none autoselect 10baseT/UTP <half-duplex> 
10baseT/UTP <full-duplex> 10baseT/UTP <full-duplex,flow-control> 
10baseT/UTP <full-duplex,hw-loopback> 100baseTX <half-duplex> 100baseTX 
<full-duplex> 100baseTX <full-duplex,flow-control> 100baseTX 
<full-duplex,hw-loopback> 1000baseT <full-duplex> 1000baseT 
<full-duplex,flow-control> 1000baseT <full-duplex,hw-loopback>
fw0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 4078
     lladdr 00:11:24:ff:fe:7e:2d:c8
     media: autoselect <full-duplex> status: inactive
     supported media: autoselect <full-duplex>
en1: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
     inet 192.168.1.70 netmask 0xffffff00 broadcast 192.168.1.255
     ether 00:11:24:92:bc:e0
     media: autoselect status: active
     supported media: autoselect
> If you don't mind, it might be easiest to copy your filewall
> rules so we can see them.  As root,
> /sbin/iptables -L -v

Sorry. I cannot expose my FW settings to a public list because
they might contain weaknesses that someone could exploit.

> If you are concerned with security and sharing your public IP address,
> may I suggest changing the public IP address ranges to something else,
> like xxx.xxx.xxx.0, yyy.yyy.yyy.0, etc, in the output.
Actually, I have no public IP addresses in the rules.
> Another question...if you have multiple ethernet devices,
> which device is 192.168.1.60 connected to?
en1 (this is a Powerbook g4 running OS X 10.5.8).

>

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