RB951G-2HnD and Yamaha receiver problem

Hello. I really need help. I cant make my MikroTik RB951G-2HnD (ROS 6.4, f/w 3.08) work with network AV receiver Yamaha HTR-6064 / RX-V671(f/w 1.47). Both pieces of hardware work well by their own but not together. If I set receiver to get IP address through DHCP then I get status “Offered” in DHCP Server menu and in log I get

dhcp1 offering lease 192.168.50.23 for 00:A0:DE:87:35:B1 without success

If i set IP manually on receiver then I still cant access it from my network (cant open web gui) and receiver also don’t see my DLNA server. If i try to ping it both from my windows pc or from WinBox i get 28-32% of packet loss. I already tried:

  • 2 different network cables. Both of them work OK with other hardware.
  • Reset receiver to factory defaults.
  • Upgraded receiver to latest firmware.
    The most weird thing that if i connect receiver directly to PC and assign IP address manually on both PC and receiver then ping is OK and I can easily access my receiver web GUI, so everything works as intended. Problem is clearly in Mikrotik and I don’t know what to do. My ROS config is very simple eth1 - WAN, eth2 и wlan = bridge1, eth2 is Master port for eth3-5, no filters, rules. Here is the result of /export compact.
[admin@MikroTik] > /export compact
# oct/11/2013 16:07:17 by RouterOS 6.4
# software id = CIW0-URFM
#
/interface bridge
add l2mtu=1598 name=bridge1
/interface wireless
set 0 adaptive-noise-immunity=ap-and-client-mode band=2ghz-b/g/n \
    channel-width=20/40mhz-ht-below country=russia disabled=no distance=\
    indoors frequency=2452 ht-rxchains=0,1 ht-txchains=0,1 \
    hw-protection-mode=rts-cts l2mtu=2290 mode=ap-bridge \
    periodic-calibration=enabled ssid=bnet tx-power=5 tx-power-mode=\
    all-rates-fixed wireless-protocol=802.11 wmm-support=enabled
/interface ethernet
set 1 speed=1Gbps
set 2 master-port=ether2
set 3 master-port=ether2
set 4 master-port=ether2
/ip neighbor discovery
set wlan1 discover=no
/interface wireless security-profiles
set [ find default=yes ] authentication-types=wpa2-psk eap-methods="" mode=\
    dynamic-keys wpa-pre-shared-key=********* wpa2-pre-shared-key=\
    ********
/ip hotspot user profile
set [ find default=yes ] idle-timeout=none keepalive-timeout=2m \
    mac-cookie-timeout=3d
/ip pool
add name=dhcp_pool1 ranges=192.168.50.20-192.168.50.50
/ip dhcp-server
add address-pool=dhcp_pool1 disabled=no interface=bridge1 name=dhcp1
/system logging action
set 0 memory-lines=100
set 1 disk-lines-per-file=100
/interface bridge port
add bridge=bridge1 interface=ether2
add bridge=bridge1 interface=wlan1
/ip address
add address=192.168.50.1/24 interface=bridge1 network=192.168.50.0
add address=10.128.94.54/22 interface=ether1 network=10.128.92.0
add address=10.128.94.54/23 interface=ether1 network=10.128.94.0
/ip dhcp-server lease
add address=192.168.50.5 always-broadcast=yes client-id=1:14:da:e9:6d:e6:c5 \
    mac-address=14:DA:E9:6D:E6:C5 server=dhcp1
/ip dhcp-server network
add address=192.168.50.0/24 dns-server=192.168.50.1 gateway=192.168.50.1
/ip dns
set allow-remote-requests=yes servers=213.108.16.3,213.108.16.133
/ip firewall nat
add action=masquerade chain=srcnat src-address=192.168.50.0/24
/ip route
add distance=1 gateway=10.128.92.1
/ip service
set telnet disabled=yes
set ftp disabled=yes
set www disabled=yes
set ssh disabled=yes
set api disabled=yes
set api-ssl disabled=yes
/ip upnp
set enabled=yes
/system clock
set time-zone-name=Europe/Moscow
/system clock manual
set time-zone=+04:00
/system leds
set 0 interface=wlan1
/system ntp client
set enabled=yes mode=unicast primary-ntp=31.28.25.35 secondary-ntp=\
    85.21.78.91
/system script
add name=pool.ntp.org policy=\
    ftp,reboot,read,write,policy,test,winbox,password,sniff,sensitive,api \
    source="/system ntp client set primary-ntp=[:resolve 0.ru.pool.ntp.org]\r\
    \n/system ntp client set secondary-ntp=[:resolve 1.ru.pool.ntp.org]"