3 items of hardware involved:

1. Netgear R7000 router with DD-WRT v24-sp2 (08/15/14) kongac (24865M) - it's dual band.
2. Raspberry Pi model B based print server, with Raspbian (Debian for Raspberry). Connected to WiFi (2,4GHz band) with ALFA AWUS050H USB adapter, HP LaserJet 3055 printer connected via USB. Running CUPS 1.5.3, and SANE. Nothing else besides that, and simple Raspbian installation.
3. Desktop running Windows 8.1 with Asus PCE68U. Connected to 5GHz WiFi on same router. Actually here all my other devices, like laptops, phones, etc. behave the same.

Problem: I cannot contact print server from desktop unless I ping desktop from print server. I do it by logging into router via ssh, and then via another ssh session to print server. When I ping desktop, first 4-5 packets are lost, and then it starts working. It does work for couple of minutes after I stop pinging. Then it stops again, and I cannot connect to print server anymore.

CUPS page is not responding, ping to print server gives

Reply from 192.168.xxx.xxx: Destination host unreachable.

Sometimes (mostly when I try to connect to CUPS page, or print while pinging):

Request timed out.

Router can be pinged/contacted from both, desktop and print server, all the time.

Dmesg on server gets lot of:

wlan0: Limiting TX power to 30 (30 - 0) dBm as advertised by [router's 2.4GHz MAC]

but not regularly. Sometimes it's every 4 seconds, sometimes it's quiet for 10 minutes. No other things in dmesg during that period.

Question: What can be wrong? Since this looks kind of strange, and it doesn't seem to be consistent (sometimes it works for half an hour after pinging, and sometimes stops after 10 seconds), I'd be grateful for any advice on how to investigate problem deeper.

3 items of hardware involved:

1. Netgear R7000 router with DD-WRT v24-sp2 (08/15/14) kongac (24865M) - it's dual band.
2. Raspberry Pi model B based print server, with Raspbian (Debian for Raspberry). Connected to WiFi (2,4GHz band) with ALFA AWUS050H USB adapter, HP LaserJet 3055 printer connected via USB. Running CUPS 1.5.3, and SANE. Nothing else besides that, and simple Raspbian installation.
3. Desktop running Windows 8.1 with Asus PCE68U. Connected to 5GHz WiFi on same router. Actually here all my other devices, like laptops, phones, etc. behave the same.

Problem: I cannot contact print server from desktop unless I ping desktop from print server. I do it by logging into router via ssh, and then via another ssh session to print server. When I ping desktop, first 4-5 packets are lost, and then it starts working. It does work for couple of minutes after I stop pinging. Then it stops again, and I cannot connect to print server anymore.

CUPS page is not responding, ping to print server gives

Reply from 192.168.xxx.xxx: Destination host unreachable.

Sometimes (mostly when I try to connect to CUPS page, or print while pinging):

Request timed out.

Router can be pinged/contacted from both, desktop and print server, all the time.

Dmesg on server gets lot of:

wlan0: Limiting TX power to 30 (30 - 0) dBm as advertised by [router's 2.4GHz MAC]

but not regularly. Sometimes it's every 4 seconds, sometimes it's quiet for 10 minutes. No other things in dmesg during that period.

Question: What can be wrong? Since this looks kind of strange, and it doesn't seem to be consistent (sometimes it works for half an hour after pinging, and sometimes stops after 10 seconds), I'd be grateful for any advice on how to investigate problem deeper.

Notes:

Both clients, printer server and desktop, get their network settings from same DHCP server (static leases outside of dhcp-range). It is dnsmasq running on server. Both get IP in same subnet, with 255.255.255.0 netmask.

3 items of hardware involved:

1. Netgear R7000 router with DD-WRT v24-sp2 (08/15/14) kongac (24865M) - it's dual band.
2. Raspberry Pi based print server, with Raspbian (Debian for Raspberry). Connected to WiFi (2,4GHz band) with ALFA AWUS050H USB adapter, HP LaserJet 3055 printer connected via USB. Running CUPS 1.5.3, and SANE. Nothing else besides that, and simple Raspbian installation.
3. Desktop running Windows 8.1 with Asus PCE68U. Connected to 5GHz WiFi on same router. Actually here all my other devices, like laptops, phones, etc. behave the same.

Problem: I cannot contact print server from desktop unless I ping desktop from ping server. I do it by logging into router via ssh, and then via another ssh session to print server. When I ping desktop, first 4-5 packets are lost, and then it starts working. It does work for couple of minutes after I stop pinging. Then it stops again, and I cannot connect to print server anymore.

CUPS page is not responding, ping to print server gives

Reply from 192.168.xxx.xxx: Destination host unreachable.

Sometimes (mostly when I try to connect to CUPS page, or print while pinging):

Request timed out.

Router can be pinged/contacted from both, desktop and print server, all the time.

Dmesg on server gets lot of:

wlan0: Limiting TX power to 30 (30 - 0) dBm as advertised by [router's 2.4GHz MAC]

but not regularly. Sometimes it's every 4 seconds, sometimes it's quiet for 10 minutes. No other things in dmesg during that period.

Question: What can be wrong? Since this looks kind of strange, and it doesn't seem to be consistent (sometimes it works for half an hour after pinging, and sometimes stops after 10 seconds), I'd be grateful for any advice on how to investigate problem deeper.

3 items of hardware involved:

1. Netgear R7000 router with DD-WRT v24-sp2 (08/15/14) kongac (24865M) - it's dual band.
2. Raspberry Pi model B based print server, with Raspbian (Debian for Raspberry). Connected to WiFi (2,4GHz band) with ALFA AWUS050H USB adapter, HP LaserJet 3055 printer connected via USB. Running CUPS 1.5.3, and SANE. Nothing else besides that, and simple Raspbian installation.
3. Desktop running Windows 8.1 with Asus PCE68U. Connected to 5GHz WiFi on same router. Actually here all my other devices, like laptops, phones, etc. behave the same.

Problem: I cannot contact print server from desktop unless I ping desktop from print server. I do it by logging into router via ssh, and then via another ssh session to print server. When I ping desktop, first 4-5 packets are lost, and then it starts working. It does work for couple of minutes after I stop pinging. Then it stops again, and I cannot connect to print server anymore.

CUPS page is not responding, ping to print server gives

Reply from 192.168.xxx.xxx: Destination host unreachable.

Sometimes (mostly when I try to connect to CUPS page, or print while pinging):

Request timed out.

Router can be pinged/contacted from both, desktop and print server, all the time.

Dmesg on server gets lot of:

wlan0: Limiting TX power to 30 (30 - 0) dBm as advertised by [router's 2.4GHz MAC]

but not regularly. Sometimes it's every 4 seconds, sometimes it's quiet for 10 minutes. No other things in dmesg during that period.

Question: What can be wrong? Since this looks kind of strange, and it doesn't seem to be consistent (sometimes it works for half an hour after pinging, and sometimes stops after 10 seconds), I'd be grateful for any advice on how to investigate problem deeper.