Hello!
Recently I bought the ASUS RT-AC56U router to share my Internet connection. However I found that using RT-AC56U I'm unable to access SAMBA shares in ISPs network. It's possible with any other router!
I found that the router doesn't perform NAT translation if destination port is TCP 445.
My ISP has some SAMBA shares in its 10.22.0.0/16 network. Router (firmware: 3.0.0.4.374_134-g9d50e8b) receive its WAN configuration via DHCP (it's a private IP address in 10.22.0.0/16 network). On computer I use static IP configuration using ISPs DNS and WINS servers. When I try to connect to SAMBA shares in ISPs network via the router Windows says the network path was not found:
It's possible to connect to the share via another router or if connect computer directly to ISPs network.
During investigation of the connection problem I installed sniffer on my computer.
Sniffer log:
According to the log NAT translation doesn't performed if destination port is 445. Packets with number 1, 3, 5 have my computer IP address 192.168.1.253 instead of 192.168.2.2. I don't know reasons of that but because of that I can not connect to SAMBA shares.
Recently I bought the ASUS RT-AC56U router to share my Internet connection. However I found that using RT-AC56U I'm unable to access SAMBA shares in ISPs network. It's possible with any other router!
I found that the router doesn't perform NAT translation if destination port is TCP 445.
My ISP has some SAMBA shares in its 10.22.0.0/16 network. Router (firmware: 3.0.0.4.374_134-g9d50e8b) receive its WAN configuration via DHCP (it's a private IP address in 10.22.0.0/16 network). On computer I use static IP configuration using ISPs DNS and WINS servers. When I try to connect to SAMBA shares in ISPs network via the router Windows says the network path was not found:
Code:
tracert -d 10.22.10.12
Tracing route to 10.22.10.12 over a maximum of 30 hops
1 <1 ms <1 ms <1 ms 192.168.1.1
2 <1 ms <1 ms <1 ms 10.22.10.12
Trace complete.Code:
nmap 10.22.10.12 -n -sS -p 139
Starting Nmap 6.40 ( http://nmap.org ) at 2013-09-09 15:56 Russian Standard Time
Nmap scan report for 10.22.10.12
Host is up (0.00088s latency).
PORT STATE SERVICE
139/tcp open netbios-ssn
Nmap done: 1 IP address (1 host up) scanned in 0.26 secondsCode:
net use \\10.22.10.12
System error 53 has occurred.
The network path was not found.During investigation of the connection problem I installed sniffer on my computer.
- I set static WAN IP address of the router to 192.168.2.2/24 and default gateway 192.168.2.1.
- Set static IP address of my computer to 192.168.2.1/24 and connect it to the router WAN interface.
- Connect to the router via Wi-Fi (computer received 192.168.1.253/24 from the router).
- Start sniffer on my computer 192.168.2.1 interface.
- Enter command: net use \\10.22.10.12
Sniffer log:
Code:
1 16:53:24 09.09.2013 0.0000000 192.168.1.253 10.22.10.12 TCP TCP:Flags=......S., SrcPort=53631,DstPort=Microsoft-DS(445), PayloadLen=0, Seq=3634602023, Ack=0, Win=8192 ( Negotiating scale factor 0x8 ) = 8192
2 16:53:25 09.09.2013 1.0015180 192.168.2.2 10.22.10.12 TCP TCP:Flags=......S., SrcPort=53632, DstPort=NETBIOSSession Service(139), PayloadLen=0, Seq=565836296, Ack=0, Win=8192 ( Negotiating scale factor 0x8 ) = 8192
3 16:53:27 09.09.2013 3.0017490 192.168.1.253 10.22.10.12 TCP TCP:[SynReTransmit #1]Flags=......S., SrcPort=53631,DstPort=Microsoft-DS(445), PayloadLen=0, Seq=3634602023, Ack=0, Win=8192 ( Negotiating scale factor 0x8 ) = 8192
4 16:53:28 09.09.2013 4.0057190 192.168.2.2 10.22.10.12 TCP TCP:[SynReTransmit #2]Flags=......S., SrcPort=53632,DstPort=NETBIOS Session Service(139), PayloadLen=0, Seq=565836296, Ack=0,Win=8192 ( Negotiating scale factor 0x8 ) = 8192
5 16:53:33 09.09.2013 9.0064930 192.168.1.253 10.22.10.12 TCP TCP:[SynReTransmit #1]Flags=......S., SrcPort=53631,DstPort=Microsoft-DS(445), PayloadLen=0, Seq=3634602023, Ack=0, Win=8192 (Negotiating scale factor 0x8 ) = 8192
6 16:53:34 09.09.2013 10.0076960 192.168.2.2 10.22.10.12 TCP TCP:[SynReTransmit #2]Flags=......S., SrcPort=53632,DstPort=NETBIOS Session Service(139), PayloadLen=0, Seq=565836296, Ack=0,Win=8192 ( Negotiating scale factor 0x8 ) = 8192
7 16:53:46 09.09.2013 22.0024080 192.168.2.2 10.22.10.12 NbtNs NbtNs:Query Request for * Workstation Service
8 16:53:47 09.09.2013 23.5052800 192.168.2.2 10.22.10.12 NbtNs NbtNs:Query Request for * Workstation Service
9 16:53:49 09.09.2013 25.0046050 192.168.2.2 10.22.10.12 NbtNs NbtNs:Query Request for * Workstation Service