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  • VLSM help required

    - by user68062
    I have confused myself following a VLSM tutorial and need to get my understanding confirmed, would this be the correct format, or am i away off again 172.31.0.0 VLSM this network address for as many subnetworks as possible, with no more than 14 hosts in each subnetwork. Show the subnet mask used. As the ip address is class b and contains 16 bits in the network portion, this means that we can have 2^16 = 65536 possible networks, to give each of these networks a maximum of 14 hosts we would use the subnet prefix \28 for each subnet. Is this correct? Thanks BB

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  • Ubuntu reset network configuration

    - by user1103294
    When I boot up my ubuntu server, it cannot connect to my wireless network anymore. It says "waiting for network configuration" for 60 seconds, boots up, but no wireless. I suspect it's because of the following reasons. I used to connect to a wireless connection named 2WIRE555, password: 123abc But then I upgraded my connection and my new wireless connection was named 2WIRE444, password:111111 Being lazy, I simply renamed 2WIRE555 to 2WIRE444 and changed the password accordingly. I was hoping this would work but ever since then my network configurations is messed up. So back to the issue, how do I reset my network configurations for my Ubuntu 11.10 server?

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  • Xen DomU does not have network connectivity

    - by Prakashkumar Thiagarajan
    I am trying to install Xen on my Fedora box. Dom0 image has network connectivity. But when I try to create a DomU, it does not have network connectivity. I want to be able to run in bridged mode. I have the /etc/xend/xend-config.sxp file accordingly. My config file looks like kernel = "/boot/vmlinuz-2.6.18-xenU" memory = 64 name = "clientA" vif = ['bridge=xenbr0,mac=12.34.56.78.9A.BC'] root = "/dev/sda1 ro" ramdisk = "/boot/initrd-linux.img" extra = "ro selinux=0.3 initcall_debug" features = 'auto_translated_physmap' Am I missing something ?

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  • What would cause my SendMail server not to acknowledge receiving a TCP Sequence?

    - by Mike B
    My TCP/IP Stack knowledge is a little rusty so please bear with me.... I have a CentOS 5.7 server with SendMail and am having seeing intermittent timeout issues sending email (particularly larger email) to other remote domains. It doesn't happen with all attachments or recipient domains. Just some. After some extended troubleshooting, I think I've narrowed it down to TCP Sequences not being acknowledged. Here's a breakdown of the TCP session from a packet capture I collected directly on my MTA (fooMTA): Packet 1 - 11: Standard TCP handshake followed by initial SMTP conversation. No errors. Packet #12 Recipient MTA: TCP sequence 231. Ack 91. Packet #13 FooMTA: TCP sequence 91. Ack 305. Packet #14 FooMTA: TCP sequence 1115. Ack 305. Packet #15 Recipient MTA: TCP sequence 305. Ack 2495. Packet #16 FooMTA: TCP sequence 2495. Ack 305. Packet #17 FooMTA: TCP sequence 5255. Ack 305. Packet #18: Recipient MTA: TCP sequence 305. Ack 5255. Packet #19: FooMTA: TCP sequence 6635. Ack 305. Packet #20: FooMTA: TCP sequence 8015. Ack 305. Packet #21: Recipient MTA: TCP Sequence 305. Ack 8015. Packet #22: FooMTA: TCP Sequence 10775. Ack 305. Packet #23: FooMTA: TCP Sequence 13535. Ack 305. Packet #24: Recipient MTA: TCP sequence 305. Ack 10775 Packet #25: FooMTA: TCP Sequence 14915. Ack 305 It keeps going like this with my server still thinking it hasn’t received sequence 305… in response the remote side eventually retransmits its prior data thinking that it never arrived. Eventually the gap gets so large that no new data is sent and the remote MTA keeps retransmitting old stuff. This contributes to an exponential backoff and eventually the remote side gives up. What’s strange to me is that I see the “missing” TCP sequence (305 in this case) arriving back to my server (via a packet capture collected directly from fooMTA) So I don’t get why my server keeps asking for it. Could this be firewall related? What would be the next step in troubleshooting?

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  • How to setup IP alias on bridged interface in Ubuntu

    - by Anonymouslemming
    How do I setup an IP alias on a bridge (br0) device on Ubuntu ? If I wait for br0 to come up and then do /sbin/ifconfig br0:0 192.168.10.1 netmask 255.255.255.0 then it works fine. If however I add the following to my /etc/network/interfaces file, it does not work and the network fails to start: auto br0:0 iface br0:0 inet static address 192.168.10.1 netmask 255.255.255.0 At the moment, I have a script in /etc/network/if-up.d/bridge_alias that does this as follows: #!/bin/bash if [ "${LOGICAL}" == "br0" ] && [ "${PHASE}" = "post-up" ]; then echo -n "Starting br0:0 ... " /sbin/ifconfig br0:0 192.168.10.2 netmask 255.255.255.0 echo "Done!" fi What is the right way of doing this though, just using the OS network config files ?

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  • What does *:* in netstat output stands for?

    - by chello
    While executing the command /usr/sbin/lsof -l -i -P -n under root user, I am getting this output. COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME ... httpd 9164 70 3u IPv4 0x2f70270 0t0 TCP 127.0.0.1:9010 (LISTEN) httpd 9164 70 4u IPv6 0x25af4bc 0t0 TCP *:80 (LISTEN) httpd 9164 70 5u IPv4 0x3149e64 0t0 TCP *:* (CLOSED) httpd 9180 70 3u IPv4 0x2f70270 0t0 TCP 127.0.0.1:9010 (LISTEN) httpd 9180 70 4u IPv6 0x25af4bc 0t0 TCP *:80 (LISTEN) httpd 9180 70 5u IPv4 0x3149e64 0t0 TCP *:* (CLOSED) Please let me know what does *:* stands for? I am interested to know both the ipaddress and port fields. Also what does (CLOSED) mean here?

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  • How do I setup a proper VPN for my friends to play LAN games AND give them internet access?

    - by Gizmo
    I'm trying to setup a VPN on my local network, but everyone who connects to me DOES have access to my laptop but not to the internet or other devices on the network. How can I properly configure my VPN on windows to work correctly (giving internet + access to all devices on my network to the remote pc)? Or is there software on windows which makes creating a VPN server easier? or maybe a VMWare image linux vpn server? I can't find any of those! My requirement is that my friends don't have to install additional software, they have to be able to connect with default windows stuff. My OS is Windows 8 Standart edition (not pro or enterprise) OEM. Most of my friends have also windows 8, some windows 7. Extra info: My device is DMZ'ed (Demilitarized Zone, [disabled NAT on my device so it's accessible on the WAN]) I can access files, websites and services on other devices on my network, and all devices can access file shares, website and all other services on my device When enabling VPN everything works except the client is unable to get internet access or access to any device on my network, client has only access to my device.

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  • linux shutdown hang with wifi cifs mounts

    - by Sirex
    Since fedora 15 (and now with 16) it seems that wireless clients take a long while to shutdown when they have network filesystems mounted at shutdown time. I've pushed out a cifs mount via puppet, and all clients have it, including those on wireless. If say a laptop is on a wired connection it shuts down just fine, but if its on the wifi at the time (and no wired connection) it'll hang at the fedora f logo. I'm not sure if its indefinite or just a really long while, but ill give it a test when i shut this machine down in a second. Needless to say its pretty annoying, so is there a way of causing the machine to shutdown even if network connectivity has been lost at unmount time, -- or an official way to reorder events so the wireless card is kept up until after the unmount happens during the shut down process (short of writing a custom script for shutdowns which is a bit of a kludge) ? It does this on multiple machines, and all started doing it when we went from fedora 14 to 15. It was such an obvious issue i'd kind of assumed someone must have reported it or there was an easy fix, but i've not discovered anything yet. Additional info: I can confirm that manually unmounting the mounts then shutting down (sudo shutdown or the xfce shutdown button) will shutdown just fine, it only hangs if the mounts are still mounted The puppet config that sets the mount looks like this (now with the _netdev entry that is indeed pushed to clients successfully, but makes no difference): file { "/mnt/share": ensure = directory,} mount { "/mnt/share": atboot = true, ensure = mounted, remounts = false, fstype = cifs, device = "//srv/share", options = "user,gid=shareusers,uid=${user},file_mode=0700,dir_mode=0700,credentials=/root/.smbcreds,_netdev", require = [ File["/mnt/share"], Group["shareusers"] ], } }

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  • Weird WLAN connection

    - by tuelsch
    I assembled my first computer on my own. As I realised it had no WLAN (AsRock Z77 Extreme 4m) I bought a WLAN stick (ZyXel NWD 2105), plugged it in, started the setup from the CD and it worked, until I restarted the PC. That's when the problems started. The stick is able to connect to the router (P-660HN-F1Z) and the connection is stable, but not the internet access. In estimately 1 minute intervals there might be a short connection timeframe and dropbox or windows update are able to download some data, but as soon as I try to open a website the internet access is away. Note that the connection to the router does not shut down and remains stable at around 80-90%. The problem is definetly located on my pc, because with my laptop and phone the connection is stable and fast. Because I was so pissed off, I bought a EW-7612PIn V2 (PCI-E WLAN adapter), same problem. Now the weird thing is, if I don't use the PC for about 2 days, start it up, there is internet access (happened with both the stick and the PCI-E card). A bit slow, but it does not get away just like that, until I shut it down. Then, no matter how many times I restart, it won't come back. I googled a lot but now I'm at the end with my latin. Has anyone had a similar problem and resolved it? Technical details: Motherboard: AsRock Z77 Extreme 4M OS: Windows 7 professional 64bit Stick: Zyxel wireless N adapter NWD2105 PCI-E card: Edimax EW-7612PIn V2 Router: ZyXel P-660HN-F1Z Windows-IP-Konfiguration Hostname . . . . . . . . . . . . : xyz Primäres DNS-Suffix . . . . . . . : Knotentyp . . . . . . . . . . . . : Hybrid IP-Routing aktiviert . . . . . . : Nein WINS-Proxy aktiviert . . . . . . : Nein Drahtlos-LAN-Adapter Drahtlosnetzwerkverbindung 5: Medienstatus. . . . . . . . . . . : Medium getrennt Verbindungsspezifisches DNS-Suffix: Beschreibung. . . . . . . . . . . : Microsoft Virtual WiFi Miniport Adapter # 3 Physikalische Adresse . . . . . . : 80-1F-02-61-C0-A6 DHCP aktiviert. . . . . . . . . . : Ja Autokonfiguration aktiviert . . . : Ja Drahtlos-LAN-Adapter Drahtlosnetzwerkverbindung 4: Verbindungsspezifisches DNS-Suffix: Beschreibung. . . . . . . . . . . : Edimax 802.11n Wireless Adapter Physikalische Adresse . . . . . . : 80-1F-02-61-C0-A6 DHCP aktiviert. . . . . . . . . . : Ja Autokonfiguration aktiviert . . . : Ja Verbindungslokale IPv6-Adresse . : fe80::38d2:f489:726d:1fb5%17(Bevorzugt) IPv4-Adresse . . . . . . . . . . : 192.168.1.41(Bevorzugt) Subnetzmaske . . . . . . . . . . : 255.255.255.0 Lease erhalten. . . . . . . . . . : Donnerstag, 15. November 2012 10:51:05 Lease läuft ab. . . . . . . . . . : Sonntag, 18. November 2012 10:51:18 Standardgateway . . . . . . . . . : 192.168.1.1 DHCP-Server . . . . . . . . . . . : 192.168.1.1 DHCPv6-IAID . . . . . . . . . . . : 578821890 DHCPv6-Client-DUID. . . . . . . . : 00-01-00-01-17-FF-D5-FE-BC-5F-F4-48-FC-4B DNS-Server . . . . . . . . . . . : 91.233.182.2 194.230.1.39 NetBIOS über TCP/IP . . . . . . . : Aktiviert Tunneladapter isatap.{263BEB98-344B-435C-888F-1B15B97C3AC1}: Medienstatus. . . . . . . . . . . : Medium getrennt Verbindungsspezifisches DNS-Suffix: Beschreibung. . . . . . . . . . . : Microsoft-ISATAP-Adapter Physikalische Adresse . . . . . . : 00-00-00-00-00-00-00-E0 DHCP aktiviert. . . . . . . . . . : Nein Autokonfiguration aktiviert . . . : Ja Tunneladapter Teredo Tunneling Pseudo-Interface: Verbindungsspezifisches DNS-Suffix: Beschreibung. . . . . . . . . . . : Teredo Tunneling Pseudo-Interface Physikalische Adresse . . . . . . : 00-00-00-00-00-00-00-E0 DHCP aktiviert. . . . . . . . . . : Nein Autokonfiguration aktiviert . . . : Ja IPv6-Adresse. . . . . . . . . . . : 2001:0:9d38:6ab8:209c:2944:3f57:fed6(Bevo rzugt) Verbindungslokale IPv6-Adresse . : fe80::209c:2944:3f57:fed6%11(Bevorzugt) Standardgateway . . . . . . . . . : :: NetBIOS über TCP/IP . . . . . . . : Deaktiviert C:\Users\xyz>ping 192.168.1.1 Ping wird ausgeführt für 192.168.1.1 mit 32 Bytes Daten: Antwort von 192.168.1.1: Bytes=32 Zeit=2ms TTL=254 Antwort von 192.168.1.1: Bytes=32 Zeit=2ms TTL=254 Antwort von 192.168.1.1: Bytes=32 Zeit=2ms TTL=254 Antwort von 192.168.1.1: Bytes=32 Zeit=2ms TTL=254 Ping-Statistik für 192.168.1.1: Pakete: Gesendet = 4, Empfangen = 4, Verloren = 0 (0% Verlust), Ca. Zeitangaben in Millisek.: Minimum = 2ms, Maximum = 2ms, Mittelwert = 2ms

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  • Identifying a CAT6 cable in a bundle

    - by Jon Tackabury
    We had a contractor wire up our office with all the cables leading back to a central location. The only problem is that he didn't label anything, so we have no idea which cables go to which room. One end of the cable is terminated in a wall-jack (in the rooms), the other end is un-terminated and will be punched to a patch panel. Is there a way to identify the cables without having to terminate them? We'd like to group the cables on the patch panel by room, but I don't want to crimp/punch each cable twice. Thanks!

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  • Slow performance with WAMP localhost access from other devices

    - by Adam
    I setup a localhost WAMP server and other device can access my localhost site on my win8 laptop with computer name instead of IP (bc I have use DCIP so that the wireless router can assign me IP otherwise it will not work). However, problem is that the website (WordPress), access speed is extremely slow on other devices other than my localhost computer, usually a 3s task take at least 10 seconds. (i.e. view my localhost site with computer name in a phone within the same wireless network.) Is that normal? What could be the reason causing it? Thank You

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  • Several border firewalls in the same network

    - by nimai
    I'm currently analyzing the consequences of multipath connections for the firewalls. In that context, I'm wondering if it's really uncommon to have several firewalls at the borders of a network to protect it. The typical case I'd imagine would be a multihomed network, for which the administrator would have different policies for links from different (or not) ISPs. Or maybe even in an ISP's network. What would be the practical (dis)advantages of such a configuration? Could you provide an example of an existing topology using several border firewalls?

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  • Internal Linux machine with Apache that I can access by IP address but not computer name

    - by Parris
    I have an Ubuntu machine running LAMP. While on the machine I can type localhost or the computers name to access htdocs. From another machine I can only access the machine via its IP Address. This just started happening recently when someone rearranged the network cables and removed a hub sitting between the machine and the network, which makes me think it wasn't all the stable to begin with anyways. Any suggestions on where I should start looking?

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  • VMWare hypervisor with only 1 network card?

    - by Rafiq Maniar
    VMWare hypervisor minimum requirements states that the minimum network requirements is: one NIC, plus one for Management interface (source: http://www.vmware.com/products/datacenter-virtualization/vsphere-hypervisor/requirements.html) It used to be possible to use 1 NIC only. Is anybody using the new versions of VMWare in this configuration? I ask because my colo provider will only provide me with 1 uplink (my server does have 2 NICs). I need to be able to run the VMs and also have remote management using only 1 NIC. Possible?

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  • Maximise network transfer speed of various applications

    - by Alex
    When using nc, scp, wget to transfer files between 2 machines on a dedicated 2Mbps link, I get speeds between 0.5 and 1 Mbps. However, when I use iperf -c 10.0.1.4 -t 20 -P 12 (for example) I can maximise the speed of the link (getting stable 2Mbps). Is there a way to make single stream transfers (such as those done by scp) to utilise all/most of the link? Some kind of tcp settings, or iptables...?

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  • How to write rules for persistent net names?

    - by ndemou
    I know that a process generates persistent network card names based on rules found in /lib/udev/rules.d/75-persistent-net-generator.rules. I also know how to completely disable this process with a simple echo '#' > /etc/udev/rules.d/75-persistent-net-generator.rules but I've read that I "could also write my own rules file to give the interface a name — the persistent rules generator ignores the interface if a name has already been set" (/etc/udev/rules.d/README confirms that this is possible). Do you have any pointers to documentation about how to write such rules? (I mostly care about Debian/Ubuntu and a bit less for CentOS) As a specific example of why I want to write custom rules: I have two identical servers with one onboard LAN and one PCI LAN. In case of HW failure I want to be able to move disks from HW#1 to HW#2 and it's important for eth0 to continue pointing to the onboard card and eth1 to the PCI card (no one wants to mess with cabling in the middle of a HW failure panic). My current workaround works but is a lot of work[1] so I wonder if writing custom rules would allow me to express something simple like this: cards with MAC A or B should be named eth0 cards with MAC C or D should be named eth1 follow default naming scheme for anything else [1] install the OS in HW#1 and keep a copy of /etc/udev/rules.d/70-persistent-net.rules. Move the disks to HW#2 and keep a second copy of the same file. Concatenate the two copies and manually edit the NAME="ethX" part. Replace /etc/udev/rules.d/70-persistent-net.rules with my version. Finally disable auto-creation of a new 70-persistent-net.rules using echo '#' > /etc/udev/rules.d/75-persistent-net-generator.rules

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  • OSD with ConfigMgr across subnets?

    - by MattUebel
    I am trying to deploy a system image from one subnet to another. Subnet A contains the SCCM server. Subnet B contains the workstation that I want to build. Subnet B contains a DHCP server with a scope configured to service the workstations. How would I configure the DHCP server so that it tells the workstations to look at the SCCM server on Subnet A as its bootserver?

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  • How to setup a wired local area network in Windows 7?

    - by user883434
    I am using a Lenovo ThinkPad X200 and want to se tup a wired local area network. How could I achieve this? Actually, my question is very simple. I just want to connect to the internet and I have a cable connection at home. So, I just want to plug the cable line to my notebook (x200) so that I can access the internet via the cable. But I dont know how to setup a local area connection in notebook. Since it automatically appear in my desktop, but not in my notebook. Thanks!

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  • Connect Ralink RT2571 to new PC

    - by tuelsch
    I bought a new PC with the AsRock Z77 Extreme 4m motherboard, since this has no WLAN, I extracted the WLAN card from my old PC, a Ralink RT 2571 WF, an connected it to the new board. I downloaded the driver from http://www.ralinktech.com/en/04_support/support.php?sn=500 (the RT257x USB one) and installed it. In the device manager, an unknown device shows up, but if I tell it to search its driver, it does not find it (searching in the whole C partition). The Ralink Diagnostic Test says that the WLAN Card is disabled. I'm using Windows 7 64bit professional. Can anyone suggest me a solution to get my WLAN running?

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  • How should my CAT6e cable be terminated? No pairs?

    - by user231465
    I have just bought 60 meters of CAT6e cables, sold as "4 pair UTP RJ45". I have looked at various videos on Youtube but I cannot determine the correct wiring. all the colors of the cable I saw there are different from mine. Mine is untwisted, and it is not color coded. I have 8 pin connectors all of a single color. How should I wire this cable? EDIT THE PACKAGE DOES SAY TWISTED but they are not (twisted).

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  • Windows 7 Won't connect to Wireless Router too far away (but still have 3 bars)

    - by Kerry
    I have found this problem a couple of times. Windows 7 with Intel AGN 5100 won't connect to a WPA2-PSK router when it's too far away. Both times I've had this happen I was in a foreign country (London and Stockholm), and both times I was upstairs while the router was downstairs. Now, it still has 2-3 bars when looking at local WiFi, but I get the "will not connect" error, and debugging doesn't help at all (it doesn't know what's wrong). I went downstairs and it connected immediately (but I need to be able to have it upstairs). My Android Cell Phone and iPad were able to connect upstairs just fine. Any suggestions?

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  • WAN and LAN setup for IPv6

    - by neu242
    We just got a IPv6 /48 range (a gateway and an IP address) for our company, but I'm unsure about how to set it up. We use FreeBSD 8.4 (pfSense 2.1) as a router/firewall. Currently we have IPv4 setup with a WAN towards the internet, and a NAT-ed LAN behind it for office PCs. We want to keep the LAN network for security, and we want IPv6 addresses from the /48 for all office PCs (without NAT). The WAN is configured with the IPv6 gateway 1111:2222:3333::1/48 and interface address 1111:2222:3333::2/48. But when it's configured this way, I guess it's impossible to fit the LAN on a /64 within the /48? I believe I should configure the WAN subnet on 1111:2222:3333:1::/64 and the LAN on a subnet like 1111:2222:3333:2::/64. Is this something I can configure myself, or do I have to ask the ISP to configure that routing for me?

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  • Windows Server 2008 R2 - Can't connect RDP over the Internet

    - by Jonathan DeMarks
    I have two networks: Domain and Public, Domain is a VPN connection and Public is the local connection to the network. This is not a domain controller or a DNS/DHCP server. I can connect via RDP from the local network (192.168.1.), from the VPN network (10.1.2.), and from the VPN network over the internet. I cannot connect from the internet (anywhere besides where the server is VPN'd) Wireshark indicates that the server is getting packets, and the audit log is indicating that the packets are being dropped. Advanced Firewall has explicit options to allow RDP, and has no deny policies. I have also tried turning Firewall off completely to no avail. I'm really lost on this one.

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  • How to set up a home WEB server Ubuntu and test over LAN Windows 7 XAMPP Lampp

    - by thejartender
    I am looking for a guide on how to set up a local home server that will also be used as a web server. I have an old desktop with Ubuntu 12.10 and wish for this to be used as my central web and local server. I also have multiple Windows 7 systems at home that I wish to be part of this network and a wireless router. Can someone provide me with assistance on where to start (perhaps just the home network) or refer me to a guide on how to do this?

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