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  • design a large scale network for an organization

    - by Essam
    i want to design a large scale network for an organization with HQ and two branches. i want to use a class A subnet. if i am using the network address 30.0.0.0 for the whole organization how can it be different from another organization company or whatever which is using the same address in another country? now i have the three locations for this organization,so i need 5 subnets [one for the HQ,two for branch A and branch B , one for connecting A to HQ and one for connecting branch B with HQ since i will use central DHCP server at the HQ,is that (number of subnetting) right? is it advisable to use class A or class B for this organization it term of address that will be wasted (let's say it is a university with two branches in two different states)?!

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  • router propogation usng OSPF

    - by liv2hak
    I am using Juniper J-series routers to emulate a small telco and VPN customer.I need to use OSPF so that the path to each internal subnet is propogated to all PE nodes.The network topology is given below. To achieve this I am planning to run the following commands in UOW-TAU and UOW-HAM. set protocols ospf area 0.0.0.0 interface ge-0/0/0 set protocols ospf area 0.0.0.0 interface lo0.0 Do I need to do any additional configuration in TAU-PE1 and HAM-PE1 routers for it to receive the OSPF paths.? I am a beginner at the routing.Any help is appreciated.

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  • Creating CNAME to delegated domain

    - by Starsky
    We are trying to configure F5 to do load balancing on 4 sub domains similar to this article... http://support.f5.com/kb/en-us/solutions/public/0000/200/sol277.html For Example prod.wip.example.com. NS F5NS1.example.com. prod.wip.example.com. NS F5NS2.example.com. test.wip.example.com. NS F5NS1.example.com. test.wip.example.com. NS F5NS2.example.com. Then we want to make cnames instead of delegating individual sub-domains, e.g. myapp.example.com CNAME prod.wip.example.com Microsoft DNS gives an error when I attempt to make the CNAME... dnscmd ns1 /recordadd example.com myapp CNAME myapp.prod.wip.example.com. Command failed: DNS_ERROR_NOT_ALLOWED_UNDER_DELEGATION 9563 (0000255b) The error makes perfect sense, but does anyone know of a way around it? Or are my NS records incorrect for this setup? Thank you, -Steve

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  • iptables advanced routing

    - by Shamanu4
    I have a Centos server acting as a NAT in my network. This server has one external (later ext1) interface and three internal (later int1, int2 and int3). Egress traffic comes from users via int1 and after MASQUERADE goes via ext1. Ingress traffic comes from ext1, MASQUERADE, and goes via int2 or int3 according to static routes. | ext1 | x.x.x.x/24 +---------|----------------------+ | | | Centos server (NAT) | | | +---|------|---------------|-----+ | | | int1 | | int2 | int3 10.30.1.10/24 | | 10.30.2.10/24 | 10.30.3.10/24 ^ v v 10.30.1.1/24 | | 10.30.2.1/24 | 10.30.3.1/24 +---|------|---------------|-----+ | | | | | | | v v | | ^ -Traffic policer- | | |_____________ | | | | | +------------------|-------------+ | 192.168.0.1/16 | | Clients 192.168.0.0/16 The problem: Egress traffic seems to be dropped after PREROUTING table. Packet counters are not changing on MASQUERADE rule in POSTROUTING. If I change the routes to clients causing the traffic go back via int1 - everything works perfectly. current iptable configuration is very simple: # cat /etc/sysconfig/iptables *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] -I INPUT 1 -i int1 -j ACCEPT -A FORWARD -j ACCEPT COMMIT *nat -A POSTROUTING -o ext1 -j MASQUERADE # COMMIT Can anyone point me what I'm missing? Thanks. UPDATE: 192.168.100.60 via 10.30.2.1 dev int2 proto zebra # routes to clients ... 192.168.100.61 via 10.30.3.1 dev int3 proto zebra # ... I have a lot of them x.x.x.0/24 dev ext1 proto kernel scope link src x.x.x.x 10.30.1.0/24 dev int1 proto kernel scope link src 10.30.1.10 10.30.2.0/24 dev int2 proto kernel scope link src 10.30.2.10 10.30.3.0/24 dev int3 proto kernel scope link src 10.30.3.10 169.254.0.0/16 dev ext1 scope link metric 1003 169.254.0.0/16 dev int1 scope link metric 1004 169.254.0.0/16 dev int2 scope link metric 1005 169.254.0.0/16 dev int3 scope link metric 1006 blackhole 192.168.0.0/16 default via x.x.x.y dev ext1 Clients have 192.168.0.1 as gateway, which is redirecting them to 10.30.1.1

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  • Routing protocols, distance vector vs link state

    - by Artem Barger
    I'm trying to figure out the differences(pros/cons) between two routing protocols approach and I would be great-full for any help, advice and explanation. As far I can say that it seems like distance vector is more static and more local based routing, since it doesn't know the network state whereas link state is more aware of current states therefore it seems more natural to use it over distance-vector, but I have a feeling like I'm missing something. And I would be glad to here about more aspects and different issues I have to consider while choosing one of them.

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  • Network monitoring solution

    - by Hellfrost
    Hello Serverfault ! I have a big distributed system I need to monitor. Background: My system is comprised of two servers, concentrating and controlling the system. Each server is connected to a set of devices (some custom kind of RF controllers, doesnt matter to my question), each device connects to a network switch, and eventually all devices talk to the servers, the protocol between the servers and the devices is UDP, usually the packets are very small, but there are really a LOT of packets. the network is also somewhat complex, and is deployed on a large area physically. i'll have 150-300 of these devices, each generating up to 100+ packets per second, and several network switches, perhaps on 2 different subnets. Question I'm looking for some solution that will allow me to monitor all this mess, how many packets are sent, where, how do they move through the network, bandwidth utilization, throughput, stuff like that. what would you recommend to achieve this? BTW Playing nice with windows is a requirement.

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  • Multiple Audio I/P and O/P simultaneaously

    - by Raj Naveen
    hi (1) i saw in one of your posts that it is possible to get different outputs in windows 7. i am eager to know more. Is there any way i can create a 2 or more virtual cable between two softwares simultaneously. so that simultaneously, two or more audio inputs will be routed to equal no of audio analysers receivers, and then the audio analysers send back a filtered audio back to respective audio inputs... Please reply to email id: [email protected]

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  • /etc/hosts.deny ignored in Ubuntu 14.04

    - by Matt
    I have Apache2 running on Ubuntu 14.04LTS. To begin securing network access to the machine, I want to start by blocking everything, then make specific allow statements for specific subnets to browse to sites hosted in Apache. The Ubuntu Server is installed with no packages selected during install, the only packages added after install are: apt-get update; apt-get install apache2, php5 (with additional php5-modules), openssh-server, mysql-client Following are my /etc/hosts.deny & /etc/hosts.allow settings: /etc/hosts.deny ALL:ALL /etc/hosts.allow has no allow entries at all. I would expect all network protocols to be denied. The symptom is that I can still web browse to sites hosted on the Apache web server even though there is a deny all statement in /etc/hosts.deny The system was rebooted after the deny entry was added. Why would /etc/hosts.deny with ALL:ALL be ignored and allow http browsing to sites hosted on the apache web server?

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  • Linux server: Dropped packets

    - by Lars
    I see dropped packets using ifconfig on my eth0 interface: eth0 Link encap:Ethernet HWaddr 00:15:17:0d:03:ca inet addr:10.0.1.2 Bcast:10.0.1.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:9000 Metric:1 RX packets:30268348 errors:0 dropped:70721 overruns:0 frame:0 TX packets:133076885 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:8699434077 (8.6 GB) TX bytes:194937313025 (194.9 GB) Interrupt:16 Memory:feae0000-feb00000 When i use ethtool -S i dont see anything wrong: NIC statistics: rx_packets: 30267138 tx_packets: 133074510 rx_bytes: 8699356158 tx_bytes: 194934147340 rx_broadcast: 35296 tx_broadcast: 5435 rx_multicast: 0 tx_multicast: 0 rx_errors: 0 tx_errors: 0 tx_dropped: 0 multicast: 0 collisions: 0 rx_length_errors: 0 rx_over_errors: 0 rx_crc_errors: 0 rx_frame_errors: 0 rx_no_buffer_count: 0 rx_missed_errors: 0 tx_aborted_errors: 0 tx_carrier_errors: 0 tx_fifo_errors: 0 tx_heartbeat_errors: 0 tx_window_errors: 0 tx_abort_late_coll: 0 tx_deferred_ok: 0 tx_single_coll_ok: 0 tx_multi_coll_ok: 0 tx_timeout_count: 0 tx_restart_queue: 0 rx_long_length_errors: 0 rx_short_length_errors: 0 rx_align_errors: 0 tx_tcp_seg_good: 5757001 tx_tcp_seg_failed: 0 rx_flow_control_xon: 8649 rx_flow_control_xoff: 62072 tx_flow_control_xon: 0 tx_flow_control_xoff: 0 rx_long_byte_count: 8699356158 rx_csum_offload_good: 30212111 rx_csum_offload_errors: 0 rx_header_split: 10857552 alloc_rx_buff_failed: 0 tx_smbus: 0 rx_smbus: 0 dropped_smbus: 0 rx_dma_failed: 0 tx_dma_failed: 0 I am running Ubuntu 12.04 with kernel 3.2.0-30-generic #48-Ubuntu SMP I have pinged every device on my internal network for about 24 hours, without packet loss. Also checked my router and my interface to the WAN, also no errors there. Does anyone have any clue?

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  • how do i automatically add a new route to the routing table?

    - by Robbie Mckennie
    I'm looking at linking two networks with a long range Ethernet bridge. I know I can connect my two networks with a router, but my problem is how will my computers know where to send packets if I don't add the route manually? I COULD add them manually, but it seems like a hassle. I have very very limited knowledge of RIP (I know it has something to do with routing), but I don't know how to use it. edit: My vision for the network would be the 2 networks (which are currently independent home networks), connected by a microwave Ethernet link. I assumed i'd need a router on one end of the bridge, to handle communication between the 2 networks.

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  • What is the difference between a plain Amazon ec2 instance and beanstalk?

    - by Alex Ford
    I am a solo developer and the sites I'm deploying are very small, usually hobby sites and I have a few questions about the Amazon services. Is there a reason for me to use beanstalk or should I just stick with a single ec2 instance? Should I use RDS for database? I heard someone say that I could just install a database on my ec2 instance, making it cheaper. I'm trying to keep everything as cheap as possible. I need to point custom domains to my sites. Pretty sure that means I have to deal with elastic IPs. Do those work with beanstalk or only with individual ec2 instances? Thanks in advance!

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  • How to prevent asymmetric routing with multiple eBGP routers?

    - by Andy Shinn
    I have 2 routers announcing a /22 subnet to different providers (one providers connects to each of the 2 routers). I have split the /22 in two /23 to announce one /23 on each of the routers plus the /22 (the providers will take the more specific route). This allows me to fail over and keep traffic inside the /23 in and out the same provider. What are other ways in which I could announce just the /22 with both routers and have packets from servers on the network behind the routers go back out the same router in which they came in from? EDIT: The main problem I come across, which end users and clients complain about the most, is that the least hop route is sometimes not the "optimal" route. In my case, I know that Provider B may have better latency to X nation. But when packets come in from provider B, they may go out Provider A or provider B. The reverse is also true. If I send a packet to X nation out provider A, even though it may have more hops back, the packet will likely come in from Provider B (which may have higher latency, packet loss, etc. to this nation)

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  • Able to ping but does not get the data

    - by Dany
    I am facing a problem in my client server program; when using wireless I can ping but not receive any data. There is a source which receives a streaming request from client via server. This works fine when all the machines are connected through LAN cable but when I put all the computers in wi-fi network, all the machine are able to ping each other but when the client send the stream request to the server the ping request between server and client says destination unreachable. It works all well until the client does not send the streaming request. What might be the issue?

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  • What about IPv4 class E?

    - by Luc
    IPv4's class E network (240.0.0.0/4) contains 268 million addresses. Despite the advertisements for IPv6, claiming we have ran out of address space, this block ironically still claims to be "Reserved for future use". Why hasn't this block been freed up yet? Of course, IPv6 should be promoted instead of freeing up more IPv4 addresses, but we've seen the address shortage coming for years. There has even been a time they weren't sure there was enough time to develop IPv6 before we would run out of addresses. Why didn't they free up this block already? And is there any chance these addresses will be used in the future, like when IPv6 is fairly widely implemented but we still need IPv4 for backwards compatibility? It will be phased out regardless, but then ISPs don't have to employ NAT for IPv4 compatibility.

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  • Simple IPV6 Address Question

    - by Daniel
    Hello, I have a /96 block of IPV6 addresses and i'm wondering how i could some how find the next address (Since ipv6 addresses can contain numbers and letters). I know the first address could be in numbers but i've yet to find out how i could really find in some kind of order for that amount of addresses E.G: What technique could i use to make sure i'll actually be able to use all of the addresses

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  • switch duplicates packets and forward in two route

    - by sami
    there is a network including a router, two hosts and a switch which connects hosts to router. i have a virtual machine on my system. the network adapter is set to act as bridge. so the virtual machine and real OS are my 2 hosts on different LAN. they use one network card and are connected to a switch. when each of host send a packet to the other one, the switch duplicate the packet and forward it to both router and the other host. how can I solve the duplicate packet problem? Thanks.

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  • Can't get IPv6 address using radvd on wireless interface on windows, wired works fine.

    - by AndrejaKo
    I set up my router to use OpenWRT and set it up to use IPv6 using a tunnel form SixXs. I'm having problems with stateless autoconfiguration using radvd. On my computer, wired connection can get its IPv6 address fine, but wireless can't. After spending some time on OpenWRT forums, I'm pretty much sure now that router is set up fine and that the problem is with my windows settings. Also, I do not have any problems getting IPv6 address on openSUSE 11.3. So what should I do to solve this and what information should I post? Here's radvdump output for wired interface: interface br-lan { AdvSendAdvert on; # Note: {Min,Max}RtrAdvInterval cannot be obtained with radvdump AdvManagedFlag on; AdvOtherConfigFlag on; AdvReachableTime 0; AdvRetransTimer 0; AdvCurHopLimit 64; AdvDefaultLifetime 1800; AdvHomeAgentFlag off; AdvDefaultPreference medium; AdvSourceLLAddress on; prefix 2001:15c0:67d0::/64 { AdvValidLifetime 86400; AdvPreferredLifetime 14400; AdvOnLink on; AdvAutonomous on; AdvRouterAddr off; }; # End of prefix definition }; # End of interface definition Here's radvdump output for wireless interface: # # radvd configuration generated by radvdump 1.6 # based on Router Advertisement from fe80::a0b7:deff:fef0:5b34 # received by interface br-lan # interface br-lan { AdvSendAdvert on; # Note: {Min,Max}RtrAdvInterval cannot be obtained with radvdump AdvManagedFlag on; AdvOtherConfigFlag on; AdvReachableTime 0; AdvRetransTimer 0; AdvCurHopLimit 64; AdvDefaultLifetime 1800; AdvHomeAgentFlag off; AdvDefaultPreference medium; AdvSourceLLAddress on; prefix 2001:15c0:67d0::/64 { AdvValidLifetime 86400; AdvPreferredLifetime 14400; AdvOnLink on; AdvAutonomous on; AdvRouterAddr off; }; # End of prefix definition }; # End of interface definition # # radvd configuration generated by radvdump 1.6 # based on Router Advertisement from fe80::a0b7:deff:fef0:5b34 # received by interface br-lan # interface br-lan { AdvSendAdvert on; # Note: {Min,Max}RtrAdvInterval cannot be obtained with radvdump AdvManagedFlag on; AdvOtherConfigFlag on; AdvReachableTime 0; AdvRetransTimer 0; AdvCurHopLimit 64; AdvDefaultLifetime 1800; AdvHomeAgentFlag off; AdvDefaultPreference medium; AdvSourceLLAddress on; prefix 2001:15c0:67d0::/64 { AdvValidLifetime 86400; AdvPreferredLifetime 14400; AdvOnLink on; AdvAutonomous on; AdvRouterAddr off; }; # End of prefix definition }; # End of interface definition

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  • F5 BIG_IP persistence iRules applied but not affecting selected member

    - by zoli
    I have a virtual server. I have 2 iRules (see below) assigned to it as resources. From the server log it looks like that the rules are running and they select the correct member from the pool after persisting the session (as far as I can tell based on my log messages), but the requests are ultimately directed to somewhere else. Here's how both rules look like: when HTTP_RESPONSE { set sessionId [HTTP::header X-SessionId] if {$sessionId ne ""} { persist add uie $sessionId 3600 log local0.debug "Session persisted: <$sessionId> to <[persist lookup uie $sessionId]>" } } when HTTP_REQUEST { set sessionId [findstr [HTTP::path] "/session/" 9 /] if {$sessionId ne ""} { persist uie $sessionId set persistValue [persist lookup uie $sessionId] log local0.debug "Found persistence key <$sessionId> : <$persistValue>" } } According to the log messages from the rules, the proper balancer members are selected. Note: the two rules can not conflict, they are looking for different things in the path. Those two things never appear in the same path. Notes about the server: * The default load balancing method is RR. * There is no persistence profile assigned to the virtual server. I'm wondering if this should be adequate to enable the persistence, or alternatively, do I have to combine the 2 rules and create a persistence profile with them for the virtual server? Or is there something else that I have missed?

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  • How to Access an AWS Instance with RDC when behind a Private Subnet of a VPC

    - by dalej
    We are implementing a typical Amazon VPC with Public and Private Address - with all servers running the Windows platform. The MS SQL instances will be on the private subnet with all IIS/web servers on the public subnet. We have followed the detailed instructions at Scenario 2: VPC with Public and Private Subnets and everything works properly - until the point where you want to set up a Remote Desktop Connection into the SQL server(s) on the private subnet. At this point, the instructions assume you are accessing a server on the public subnet and it is not clear what is required to RDC to a server on a private subnet. It would make sense that some sort of port redirection is necessary - perhaps accessing the EIP of the Nat instance to hit a particular SQL server? Or perhaps use an Elastic Load Balancer (even though this is really for http protocols)? But it is not obvious what additional setup is required for such a Remote Desktop Connection?

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  • Host forwarding fails, server is up, domain name tests ambiguous

    - by jayunit100
    I have a domain name registered with http://www.registryrocket.com/ The "main" site, which is called rudolfcode.net, is registered under godaddy, and forwards to a heroku site (rudolfcode.herokuapp.com). I have found that the main site, rudolfcode.net works, but the hostgator forwarding has stopped working (firefox simply fails when you point to http://www.rudolflabs.com, which is the domain name registered by hostgator). How can I debug this issue ? Finally, I have tried to run some DNS tests, and here are the results : Im not sure what the failures mean .... But Im pretty sure that "Conecting to WWW Home Page" failed is a pretty bad sign ! Thanks.

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  • What happens when ARP Request comes from a different subnet?

    - by gsinha
    What will happen when an ARP Request packet is sent from router1 to router2 in the following two cases? Will an ARP Reply be generated or the ARP Request packet be dropped? [router1]Intf1(20.0.0.1/24) ======== (40.0.0.1/24)Intf2[router2] [router1]Intf1(20.0.0.1/24) ======== (20.0.0.2/8) Intf2[router2] The topology above have a port "Intf1" on router "router1" connected a port "Intf2" on another router "router2" via a direct link(eg, a 1 Gbps cable).

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