[ale] nslookup OK - No ping or access from proxy client

Don Thrash don at donthrash.com
Sat Jun 10 21:49:05 EDT 2023


Thank you!! That was a bit of help.  Got me thinking .  Squid access log 
is loaded with:  TCP_DENIED/403.  Now going on a trip down that rabbit hole.

Don Thrash


On 6/10/2023 4:23 PM, Boris Borisov via Ale wrote:
> The old fashion way.
>
> iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
> echo 1 > /proc/sys/net/ipv4/ip_forward
>  instead eth0 there is the name of your wifi device
>
> .<bugyatl at gmail.com> wrote:
>
>     When you say proxy server do you mean you running proxy software
>     on it or you just using it as getaway?
>
>     On Sat, Jun 10, 2023, 20:56 Don Thrash via Ale <ale at ale.org> wrote:
>
>         Hi Guys! My name is Don Thrash. I have been using Linux for
>         quite a
>         while but the head isn't what it used to be. So I am looking
>         for a
>         little help.  I am setting up a proxy server on the following
>         machine.
>         I had it working a week ago.  Now I am totally confused.  The
>         issue is
>         the proxy client does not get routed to the networks (local or
>         internet). Ping of google.com <http://google.com> from the
>         client returns the correct ip
>         address, but the ping returns timed out.  Typing in the ip
>         returns timed
>         out.  The client is a Windows 10 box, I also tried my Ubuntu
>         laptop with
>         the same result.
>
>         Ubuntu 22.04.2 LTS (GNU/Linux 5.19.0-43-generic x86_64)
>
>         wlx002522451a1f - WiFi from house to shed 192.168.1.0
>
>         enp0s25 - Wired shed network - 10.42.0.0
>
>         dont at Shed2:~$ route -n
>         Kernel IP routing table
>         Destination     Gateway         Genmask         Flags Metric
>         Ref    Use
>         Iface
>         0.0.0.0         192.168.1.1     0.0.0.0         UG 600 0        0
>         wlx002522451a1f
>         10.42.0.0       0.0.0.0         255.255.255.0   U 100 0       
>         0 enp0s25
>         192.168.1.0     0.0.0.0         255.255.255.0   U 600 0        0
>         wlx002522451a1f
>
>           sudo iptables -L
>         [sudo] password for dont:
>         Chain INPUT (policy ACCEPT)
>         target     prot opt source               destination
>
>         Chain FORWARD (policy ACCEPT)
>         target     prot opt source               destination
>
>         Chain OUTPUT (policy ACCEPT)
>         target     prot opt source               destination
>
>         Network connections from server work correctly.
>
>           ifconfig
>         enp0s25: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
>                  inet 10.42.0.1  netmask 255.255.255.0 broadcast
>         10.42.0.255
>                  inet6 fe80::a88e:9d27:e490:8c8d  prefixlen 64 scopeid
>         0x20<link>
>                  ether 00:1e:4f:c7:0a:c0  txqueuelen 1000 (Ethernet)
>                  RX packets 26627  bytes 2224357 (2.2 MB)
>                  RX errors 0  dropped 0  overruns 0  frame 0
>                  TX packets 14280  bytes 9276316 (9.2 MB)
>                  TX errors 0  dropped 0 overruns 0  carrier 0 collisions 0
>                  device interrupt 21  memory 0xfebe0000-fec00000
>
>         lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
>                  inet 127.0.0.1  netmask 255.0.0.0
>                  inet6 ::1  prefixlen 128  scopeid 0x10<host>
>                  loop  txqueuelen 1000  (Local Loopback)
>                  RX packets 10037  bytes 912910 (912.9 KB)
>                  RX errors 0  dropped 0  overruns 0  frame 0
>                  TX packets 10037  bytes 912910 (912.9 KB)
>                  TX errors 0  dropped 0 overruns 0  carrier 0 collisions 0
>
>         wlx002522451a1f: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>
>         mtu 1500
>                  inet 192.168.1.164  netmask 255.255.255.0 broadcast
>         192.168.1.255
>                  ether 00:25:22:45:1a:1f  txqueuelen 1000 (Ethernet)
>                  RX packets 235508  bytes 162967763 (162.9 MB)
>                  RX errors 0  dropped 6  overruns 0  frame 0
>                  TX packets 183068  bytes 31113448 (31.1 MB)
>                  TX errors 0  dropped 0 overruns 0  carrier 0 collisions 0
>
>
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