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  • Spanning-Tree and redundant links

    - by Franko
    I have 2 switches which have redundancy between them, meaning fa0/1 on SW1 is connected to fa0/1 on SW2, and fa0/2 on SW1 is connected to fa0/2 on SW2. Both of the switches have the same BID, however the MAC address of SW1 is numerically lower, hence making it the root bridge. Now my question is, on SW2, what determines which of fa0/1 and fa0/2 becomes the RP (Root Port) and the other on blocking state?

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  • arp "who-has tell" on cloned machine

    - by mcmorry
    I have a urgent problem to solve today, but I'm lost. Please help. I've cloned a Virtual Machine hosted on VM Ware ESXi 4.1 The OS is now Ubuntu Server 12.04 LTS, but at the time of cloning it was 10.04 LTS. I fixed the MAC address manually inside /etc/udev/rules.d/70-persistent-net.rules. It is a known problem on Ubuntu. I had to remove the old MAC address and set the new one as eth0. Everything seems to work fine, except ARP. My provider OVH sent me a warning to resolve it today (this is the second day) or they will block my IP! The log contains many lines like this: Tue Jun 5 01:04:29 2012 : arp who-has 178.32.136.212 tell 178.32.136.224 where .224 is the cloned server that is causing problems, and .212 is the cloned one. arp -na returns: ? (178.33.230.254) at 00:07:b4:00:00:02 [ether] on eth0 ? (178.32.136.212) at 00:50:56:09:8e:f1 [ether] on eth0 The first IP is the ESXi machine. The second one should not be there. I'm not an expert and I don't know what else to do to fix this problem. Any help will be very appreciated. Thanks. EDIT: ifcofig on .224: eth0 Link encap:Ethernet HWaddr 00:50:56:01:32:c6 inet addr:178.32.136.224 Bcast:178.32.136.255 Mask:255.255.255.0 inet6 addr: fe80::250:56ff:fe01:32c6/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:399924 errors:0 dropped:465 overruns:0 frame:0 TX packets:241884 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:58006071 (58.0 MB) TX bytes:663603166 (663.6 MB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:516216 errors:0 dropped:0 overruns:0 frame:0 TX packets:516216 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:236284275 (236.2 MB) TX bytes:236284275 (236.2 MB) ifconfig on .212: eth0 Link encap:Ethernet HWaddr 00:50:56:09:8e:f1 inet addr:178.32.136.212 Bcast:178.32.136.255 Mask:255.255.255.0 inet6 addr: fe80::250:56ff:fe09:8ef1/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:16014 errors:0 dropped:0 overruns:0 frame:0 TX packets:14511 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:15134444 (15.1 MB) TX bytes:2683025 (2.6 MB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:9944 errors:0 dropped:0 overruns:0 frame:0 TX packets:9944 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:1139347 (1.1 MB) TX bytes:1139347 (1.1 MB)

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  • Form-Fitting Laptop Hard Drive?

    - by Peder Rice
    Not sure how to explain this exactly... if you need me to clarify, please add a comment and I'll address it. I'm looking for a USB hard drive that conforms to a laptop. Perhaps something that can be plugged in and carried around, tossed into a backpack without fear of ruining the connector or accidentally coming unplugged. Has anyone seen a hard drive like this?

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  • cisco 2851 router: can't view switch ports

    - by red888
    I want to setup vlans on a 2851, but I'm not sure how to access the switch ports. I can access or view them. Is there something I have to enable? I have some devices plugged into the switch ports and they are communicating with each other fine. router(config)#do show ip int bri Interface IP-Address OK? Method Status Protocol GigabitEthernet0/0 unassigned YES NVRAM administratively down down GigabitEthernet0/1 unassigned YES NVRAM administratively down down GigabitEthernet1/0 10.1.1.1 YES manual up up

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  • Same network same switch but computers can't talk "ping"to eachother [closed]

    - by Sue
    Possible Duplicate: How does IPv4 Subnetting Work? Each computer(all 2 of them) can ping the router but can't ping each-other and firewall is off. Same default gateway, IP address very similar (just two number away at end) but the subnet mask is different between these two computers. One ends in 192 the other 224. There is a switch between them that then connects to the router. Why can't the computers ping each-other?

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  • ntpdate works, but ntpd can't synchronize

    - by dafydd
    This is in RHEL 5.5. First, ntpdate to the remote host works: $ ntpdate XXX.YYY.4.21 24 Oct 16:01:17 ntpdate[5276]: adjust time server XXX.YYY.4.21 offset 0.027291 sec Second, here are the server lines in my /etc/ntp.conf. All restrict lines have been commented out for troubleshooting. server 127.127.1.0 server XXX.YYY.4.21 I execute service ntpd start and check with ntpq: $ ntpq ntpq> peer remote refid st t when poll reach delay offset jitter ============================================================================== *LOCAL(0) .LOCL. 5 l 36 64 377 0.000 0.000 0.001 timeserver.doma .LOCL. 1 u 39 128 377 0.489 51.261 58.975 ntpq> opeer remote local st t when poll reach delay offset disp ============================================================================== *LOCAL(0) 127.0.0.1 5 l 40 64 377 0.000 0.000 0.001 timeserver.doma XXX.YYY.22.169 1 u 43 128 377 0.489 51.261 58.975 XXX.YYY.22.169 is the address of the host I'm working on. A reverse lookup on the IP address in my ntp.conf file validates that the ntpq output is correctly naming the remote server. However, as you can see, it appears to just roll over to my .LOCL. time server. Also, ntptrace just returns the local time server, and ntptrace XXX.YYY.4.21 times out. $ ntptrace localhost.localdomain: stratum 6, offset 0.000000, synch distance 0.948181 $ ntptrace XXX.YYY.4.21 XXX.YYY.4.21: timed out, nothing received ***Request timed out This looks like my ntp daemon is just querying itself. I am thinking about the possibility that the router-I-don't-control between my test network timeserver and the corporate network timeserver is blocking on source port. (I think ntpdate sends on port 123, which gets it around that filter and is why I can't use it while ntpd is running.) I have email in to the network folks to check that. Finally, telnet XXX.YYY.4.21 123 never times out or completes a connection. The questions: What am I missing, here? What else can I check to try to figure out where this connection is failing? Would strace ntptrace XXX.YYY.4.21 show me the source port ntptrace is sending from? I can deconstruct most strace calls, but I can't figure out the location of that datum. If I can't directly examine the gateway router between my test network and the timeserver, how might I build evidence that it's responsible for these disconnections? Alternately, how might I rule it out?

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  • Postfix server to receive emails for anyonymous user

    - by sachitad
    I have a postfix server configured with imap. Only the recipient with the user account in the system is accepted. For example: rcpt to: test@localhost will yield the following error: 550 5.1.1 <test@localhost>: Recipient address rejected: User unknown in local recipient table What I want to achieve is setup virtual maps which accepts email to all the users (even if the user doesn't accept in the system) then forward all those emails to a specific user mailbox. Is something like this, possible?

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  • emails not working after domain has been forwarded to new hosting?

    - by jan
    What's the best course of action after the forwarding of domain has been done and apparently the email has been forgotten to be taken into account? I just forwarded the domain to a new server hosting and i forgot to take into account the emails from the old provider? A few concerns arise: the emails won't be lost, right? will pointing the MX records to the old mail server IP address fix this issue right away? Thanks!

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  • Exchange2010 has Private Machine Name and IP in outbound SMTP - How to remove?

    - by John Bergman
    We have a domain (domain.local) that has IP Addresses in the 10.10.10.* range. In the outbound SMTP server traffic, I see the internal machine name (exchange.domain.local), and the internal ip address (10.10.10.55). The question is, how do you remove this header from exchange, or change it to have the external machine name/ip addresses. I am not talking about the HELO / EHLO handshake as part of the protocol. Please help.

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  • How to deliver mail locally and to remote mta?

    - by Silvia
    I am running a postfix server and now I would like to know if I can configure postfix to deliver mail to a virtual domain locally and also forward it to a second remote mta. The problem is that both mta handle the same virtual domains so virtual_alias_maps, bcc or anything other address/domain related will not work. If this setup is not possible with postfix, is there another mta (maybe exim?) that is capable of doing this?

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  • Configuring snedmail to forward mail for a specific domain to a specific mail server without using M

    - by aHunter
    I am new to sendmail and would like to configure sendmail to forward all mail for a specific email address to another internal mail server. I need it to ignore the MX records and only send it to the server I specify but am not sure which files to edit or how to configure the sendmail config. Is it sufficiant to add the server to the /etc/hosts and the /etc/mail/local-host-names files? Thanks in advance.

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  • SPF blocking some emails. How to complete disable it?

    - by Rafael Colucci
    We have configured a SMTP server on IIS. We have not configured any SPF rule. Some emails are going straight to the badmail folder. Most of them have this error message: Address does not pass the Sender Policy Framework Is there any way to disable that? I know this is insecure and spammers could use it to send spam, but I really need it to be disabled for now until I have configured and tested the SPF correctly.

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  • unknown reciever Esmtp

    - by Morteza Soltanabadiyan
    I found this in my log server: sm-mta[11410]: r9BKb6YY021119: to=<[email protected]>, ctladdr=<[email protected]> (33/33), delay=2+07:24:18, xdelay=00:00:01, mailer=esmtp, pri=29911032, relay=mail1.mkuku.com. [58.22.50.83], dsn=4.0.0, stat=Deferred: Connection refused by mail1.mkuku.com. This message is repeated every 10-30 seconds with a different "to" address. What is this? Is my server being used to send spam?

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  • tomcat server is not starting,

    - by KItis
    I am running tomcat server on Fedora machine. when I run tomcat using following command, service tomcat start it runs on localhost , but when i try to connect to the server using public ip address of the server as follows remotly http://xxx.xxx.xxx.xxx:8080 it does not start could someone help me with this issue Thanks in advance for any help

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  • How to configure fetchmail to send messages from remote smtp server to Gmail?

    - by ifesdjeen
    Hi, I've been trying to setup email forwarding through fetchmail from remote smtp server to Gmail account, although messages are constantly coming to my local address and accessible via "mail" command. SMTP connection works perfectly, but emails do not go anywhere. System: debian, fetchmail Config: poll smtp.server protocol imap username “user” password “pass” smtpname “[email protected]” ssl Thank you!

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  • Windows: make browsers do a DNS-lookup even when the Computer is offline

    - by leosok
    I use a local DNS-Server (MicroDNS) which I set via netsh to redirect any query to my own page. A little webserver running inside my software answering something like "this page is not whitelisted". It works when connected to the Internet but does not work when offline. The Browsers stop looking up the DNS. How could I make Browsers go to my page, whatever I enter in the address line, WHEN OFFLINE?

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  • Citrix Plug-in with TCP/IP access

    - by Mat Banik
    I have created for user file named serverDesktop.ica with following content: [ApplicationServers] XenApp= [XenApp] TransportDriver=TCP/IP Address=IP or DOMAIN NAME of the Server ProxyType=auto WinStationDriver=ICA 3.0 Username= Domain= Password= InitialProgram= WorkDirectory= ClientAudio=On ScreenPercent=100 DesiredHRES=1024 DesiredVRES=768 DesiredColor=8 [WFClient] Version=2 The above just gives the user remote desktop to the server. The question is how do I bring up all the Apps in farm via TCP/IP. The Citrix online plugin does not allow the same access as Program Neighborhood did to farms. Please help.

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  • VMware Server 2.0 in Linux loads a blank screen at the login page

    - by Neil
    I'm using VMware Server 2.0.1-156745.i386 for Linux on Ubuntu 8.10. When I run "vmware", it brings up what is supposed to be the login page in a browser, but it just loads a blank page. This is the address: https://127.0.0.1:8333/ui/ Sometimes the login page comes back if you reload it a bunch of times, but this time it won't. Doing this also doesn't help: /etc/init.d/vmware restart Does anyone know why this happens, and how to fix it?

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  • Routing with VPN and asymmetric communication

    - by Louis
    I'm stumbling on a problem that requires your advice. Keywords : networking, route, openVPN Problem : I have a local network with several physical servers and VMs. These machines have ip's in the range 10.10.x.x. I can access these machines from the Internet with the help of openVPN. These machines can : access each other within the local 10.10.x.x subnet access the Internet via the VPN can themselves be accessed (via SSH) from the Internet via the VPN. There is one machine however that behaves strangely and I don't know why. I can SSH into this machine from anywhere via SSH and I can also PING it from anywhere (including the Internet). However from this machine (i.e. when logged into it) I cannot access the Internet or ping machines outside the local network. In other words it will not go beyond the VPN. My question is why? Here are some technical details: The machine's Network Config (running Debian 6.0.3): allow-hotplug eth0 iface eth0 inet static address 10.10.10.200 netmask 255.255.0.0 network 10.10.10.0 broadcast 10.10.10.255 gateway 10.10.10.200 The machine's Routing : Destination Gateway Genmask Flags MSS Window irtt Iface 127.0.0.1 0.0.0.0 255.255.255.255 UH 0 0 0 lo 10.10.0.0 10.10.10.250 255.255.0.0 UG 0 0 0 eth0 10.10.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0 0.0.0.0 10.10.10.250 0.0.0.0 UG 0 0 0 eth0 0.0.0.0 10.10.10.200 0.0.0.0 UG 0 0 0 eth0 The VPN's Network Config (running Debian 6.0.3): # This is the local network interface auto eth1 allow-hotplug eth1 iface eth1 inet static address 10.10.10.250 netmask 255.255.0.0 broadcast 10.10.10.255 gateway 10.10.10.250 The VPN's routing table Destination Gateway Genmask Flags MSS Window irtt Iface 10.10.0.0 0.0.0.0 255.255.255.0 U 0 0 0 tun0 private 0.0.0.0 255.255.255.0 U 0 0 0 eth0 10.10.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth1 0.0.0.0 10.10.10.250 0.0.0.0 UG 0 0 0 eth1 0.0.0.0 private 0.0.0.0 UG 0 0 0 eth0 net.ipv4.ip_forward = 1 on both machines. there are no iptables set anywhere. Thanks in advance for any feedback.

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