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• Mounting Gluster Volumes

  - by Roman Newaza

  I have created Hosted Zone with 2 IP addresses of Gluster Cluster, both IP are returned by dig. After mounting Gluster, I cannot ls mount point as it takes long time. mount shows me it's mounted, but df doesn't. Finally, I have this: ls: cannot access /mnt/storage: Transport endpoint is not connected. But if I mount it with the one of the IP, no problem - volume contents is accessible OS: Ubuntu 11.10 GlusterFS: 3.2.6 Log: http://pastie.org/private/2jgp4h1hnqgzych3djtg I have can telnet storage from client - ports are open.

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• DHCPOFFER delay VLAN

  - by john883

  I have configured two VLANs [ 15 and 16 ] and a trunkport on a Cisco Catalyst 2960. The trunkport is connected to eth2 on a Linux server The server is configured to support VLAN's and the interfaces eth2.15 eth2.16 is configured with ip addresses on two different subnet. dhcp3-server is running on the same server and hands out IP-addresses to the VLANs. When connecting a client to a port that is configured in ex. VLAN 15 and requesting a IP-address, i experience a long delay before recieving a DHCPOFFER, around 30 seconds or so, the client needs to send a DHCPDISCOVER about five times but will always recieve a DHCPOFFER. Any suggestion why this delay is happening?

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• Possible to get OpenDNS to dereference Host on VPN?

  - by Scott P

  I recently changed ISPs for my home internet. I am now having some trouble getting back into the corporate network from home over the VPN. I have figured out the OpenDNS is resolving the Hosts on the VPN incorrectly when I am using TCP/IP. When I browse to one of the hosts on corporate network, i.e. \host1, from the file manager this succeeds. However, when I ping the host, i.e. ping host1, the IP address is resolving to the OpenDNS name server instead of the actual Host IP address. Does anyone know how to make this work? On a hunch, I turned off type correction. But, this did not help.

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• is it possible for a router to provide different gateway?

  - by Hao

  i have tp-link wireless router 192.168.10.188, i was can make it function as DHCP provider(range 192.168.10.100 to 192.168.10.109). the only thing that i cannot make it work as intended, is for it to provide different gateway (192.168.10.1), the computers that obtain IP from that router properly get everything(dynamic IP and dns IP), but there is no function on that router to provide different gateway, the computers always get the router's address(192.168.10.188) as gateway. is there a router that can provide different gateway other than its own address? or the question should be, is the dhcp of a router can provide different gateway other than its own address? note: i cannot make the wireless router address as 192.168.10.1, we have main router(non-wireless, address is 192.168.10.1) that is connected directly to internet

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• TCP connection stuck in SYN_RECV state despite ACK received, Linux 2.6.18, embedded, ARM

  - by waynix

  My client cannot connect to my protocol port (TCP) after some network glitches, even though all other protocols (telnet/HTTP/FTP) work fine. netstat shows that my server is listening and tcpdump on the server shows all 3 packets are exchanged: 18:29:16.578964 IP 10.9.59.10.3355 10.9.43.131.5084: S 2602965897:2602965897(0) win 65535 <mss 1460,nop,nop,sackOK> 18:29:16.579107 IP 10.9.43.131.5084 10.9.59.10.3355: S 3464857909:3464857909(0) ack 2602965898 win 5840 <mss 1460,nop,nop,sackOK> 18:29:16.579284 IP 10.9.59.10.3355 10.9.43.131.5084: . ack 1 win 65535 But somehow netstat -t shows the connection still in SYN_RECV, as if the ack is not seen by the TCP state machine. I have to restart my server to get it to work. syncookie is not enabled, and I know from client code behavior and tcpdump that there is no SYN flooding. Help much appreciated.

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• Trixbox CentOS Default GW Problem (Multi-homed server)

  - by slashp

  I'm having an issue with a CentOS trixbox server which is dual-homed (one private facing NIC [eth1], one internet-facing NIC [eth0]). I can't seem to get the default gateway to set properly to our ISP's GW via eth0. I've modified the /etc/sysconfig/network to contain both a GATEWAY & GATEWAYDEV line and removed the GATEWAY line from /etc/sysconfig/network-scripts/ifcfg-eth1 (as well as /etc/sysconfig/network-scripts/ifcfg-eth0). No default GW shows up in the routing table unless it's specified in the ifcfg-eth1 file (which both the wrong interface and wrong gateway IP), otherwise, the routing table simply does not contain a default gateway..any ideas would be greatly appreciated! Thanks! EDIT Just realized when attempting to add the default gateway manually using the route add command, I receive an error stating: SIOCADDRT: Network is unreachable I know this error can occur when your default gateway and interface IP address are not on the same subnet..in this case, my public IP address of eth0 is a /29.

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• PHP/mail : server sends email originating from wrong domain

  - by Niro

  I have a Mediatemple dv (Plesk) server with two domains, each has static IP. I had domain1 as main domain and domain2 as secondary. When A PHP script from domain2 sends email the headers show the IP address of domain1 as the origin. Received: from domain2.com (domain1.com [70.ipof domain1]). I want only domain2 to be mentioned so I did the following: Changed server name to domain2.com made domain2.com the primary domain (about 30 hours ago) made fixed IP address of domain2.com the default address for the server. Still when the script sends emails I see the same info as above in the header. What do I need to do to make the email origin domain2.com?

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• Best way to replicate servers

  - by Matthew

  I currently have two servers both with linux software RAID1 configurations. They use heartbeat and DRBD to create a shared DRBD device that hosts a a exported NFS directory. The servers run Ubuntu Server with a LXDE GUI and some IP These servers are going to be placed on fishing vessels to act has redundant storage for IP cameras. My boss wants me to figure out the most efficient way to create these servers. We might be looking at pushing out several systems a week. Each configuration will be almost identical besides IP addressing. What would be the best method to automate the configuration process? We are trying to cut down on labor costs to set these up. Imaging and Proceeding are both on my mind right now

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• DNS is resolving fine but can't access the server (unless changing /etc/hosts)

  - by victor hugo

  Hi all, I have a VPS server with a public IP, I added some A entries in my name server like svn.example.com - 1.1.1.1 Also I added some entries in my workstation /etc/hosts file in order to work with the domains meanwhile the DNSs were refreshed. It's been around 3 days from this and I configures everything in my server (using the hosts file), the DNSs are ready and I removed the entries but for my surprise I can access the servers nor anything in my domain or sub-domains (even a ping doesn't work). I've triple checked and the DNSs are OK. I don't know too much about DNSs . Any help would be appreciated. The IP address of my VPS is 74.63.223.43 I have these domain names, all pointing to the same IP (using A entries) hartoingenio.com www.hartoingenio.com svn.hartoingenio.com

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• DNS settings for SaaS in the cloud?

  - by Jeremy

  I am building a SaaS product. When a user signs up for an account they must select an alias for their site --------.getlaunchpoint.com. Right now I have an A record *.getlaunchpoint.com that points to the ip address server. However, with Azure I am not given an IP address. The suggested implementation is to make use of a CNAME. I need to create a CNAME for *.getlaunchpoint.com - getlaunchpoint.cloudapp.net GoDaddy does not support CNAME wildcards. Searching on Google I'm getting conflicting information... is CNAME wildcard a bad practice? I run into the same problem with Amazon EC2 if I want to make use of load balancers because you cannot tie a public IP address to an Amazon Load Balancer. Amazon also suggests the use of a CNAME. Any help would be appreciated.

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• Windows file sharing connects over WiFi instead of LAN

  - by zacaj

  I have a laptop and a desktop computer, and I need to sync lots of files to the laptop and back whenever I go on a trip, etc. I've got a LAN cable connected into an extra port on the desktop that I plug into the laptop so I can get gigabit file transfers instead of wireless G. They connect fine. If I do an FTP transfer, for instance, using the LAN IP addresses, it goes at ~40MB/s, as it should. However when I copy files using explorer and native windows file sharing it detects the other computer by name, not IP (eg \\DESKTOP-PC\ instead of \\192.168.0.100\) and always connects to it by its wireless IP address instead of the faster LAN address. Both computers are running Windows 7. I have tried editing the priorities of the adapters in Advanced Settings and putting the LAN adapters above the wifi ones, but this didn't have any effect

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• NAT rules betweek 2 network interfaces (with iptables)

  - by Simone Falcini

  this is the current network that I have: UBUNTU: eth0: ip: 212.83.10.10 bcast: 212.83.10.10 netmask 255.255.255.255 gateway 62.x.x.x eth1: ip: 192.168.1.1 bcast: 192.168.1.255 netmask: 255.255.255.0 gateway ? CENTOS: eth0: ip: 192.168.1.2 bcast: 192.168.1.255 netmask 255.255.255.0 gateway 192.168.1.1 I basically want this: Make specific NAT rules from the internet to specific internal servers depending on the port: Connections incoming to port 80 must be redirected to 192.168.1.2:80 Connections incoming to port 3306 must be redirected to 192.168.1.3:3306 and so on... I also need one NAT rule to allow the servers in the subnet 192.168.1.x to browse the internet. I need to route the requests on eth0 to eth1 to be able to exit to internet. Can I do this on the UBUNTU machine with iptables? Thanks!

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• Best way to split LAN computers on two WANs (not load balancing)

  - by lpfavreau

  What is the best way to split the computers of a LAN (about 50 computers) to go on two WANs, depending on the computers' IP address or computers' configuration (gateway). I'm not looking for load-balancing, I need to be able to route which computer uses which Internet connection. A solution would be to rewire the old office to split the two distinct groups that need to use two different Internet connections but I'm not sure it's worth it at the moment. I have a pfSense router configured with the LAN (DHCP), WAN1 and WAN2. I also have the IP addresses (and ability to configure) the next router on WAN1 and the one on WAN2. What would you suggest? Routing based on IP addresses ranges? Different gateways? VLANs would be difficult for the same reason as to why rewire is a bit complicated. Thanks!

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• postfix, webmin installed. whats next?

  - by Johnny Craig

  Im trying to get imap running and dont know the problem. i a developer, not a network guy.( our network guy left) we had postfix installed already for outgoing mail on 8 domains. we only had incoming on 1 domain. but that mail server is located on a different ip. now we want incoming on another domain, but we dont want it on another ip, we want it on the same ip as the website itself. I installed dovecot today because my hosting company said i needed it. it seems to run fine. do i need dovecot AND postfix? or are they the same thing? dovecot does not show up anywhere in webmin what i cant seem to figure out how to do is add a user email so i can try to telnet in on port 143. i think i have evrything installed, just need the next step.... sorry for the newb question

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• once VPNed into pfSense, unable to hit the public URLs of my websites - they are routed to the pfSense box

  - by Sean

  I have a pfSense box setup as the firewall/router/VPN appliance at my colo. Once I VPN into the colo (either pptp or openvpn, pptp preferred due to multiple clients and ease of configuration), I am able to hit all my servers by their private 10.10.10.x ip and am able to browse the public internet without issue. When I try and hit the URL of a domain hosted by one of my servers, I am prompted for credentials. If I login using the pfSense credentials, I'm connected to pfSense as if I'd used it's internal IP. If I hack my hosts file to point url - server private IP it works fine, but this is obviously not a good solution. To recap: not connected to VPN - www.myurl.com works connected to VPN - www.myurl.com never makes it to the correct server, but is sent only to the pfSense box I'm sure it's something small that I've missed in the pfSense config.

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• ASA firewalls: how does stateful filtering affect my access lists?

  - by Nate

  Ok, so assume that I have an ingress access list that looks like this: access-list outside_in extended ip permit any X.Y.Z.1 eq 25 access-group outside_in in interface outside And I want to do egress filtering. I want to allow inside machines to respond on port 80, and I want to allow ports over 1024. Given that the firewall is statefull, do I need to have the rule access-list inside_in extended ip permit X.Y.Z.1 any eq 25 in my inside_in ACL, or can I get away with just access-list inside_in extended ip permit any any gt 1024 access-group inside_in in interface inside In other words, if I apply an egress access list, do I have to explicitly allow machines to respond to requests allowed by the ingress access list, or does the statefullness of the firewall handle that for me? Thanks!

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• Iptables NAT logging

  - by Gerard

  I have a box setup as a router using Iptables (masquerade), logging all network traffic. The problem: Connections from LAN IPs to WAN show fine, i.e. SRC=192.168.32.10 - DST=60.242.67.190 but for traffic coming from WAN to LAN it will show the WAN IP as the source, but the routers IP as the destination, then the router - LAN IP. I.e. SRC=60.242.67.190 - DST=192.168.32.199 SRC=192.168.32.199(router) - DST=192.168.32.10 How do I configure it so that it logs the conversations correctly? SRC=192.168.32.10 - DST=60.242.67.190 SRC=60.242.67.190 DST=192.168.32.10 Any help appreciated, cheers

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• Two mail servers, need help with dns configuration for the backup one

  - by user92231

  I need to run a redundant backup mail server in case the main one goes down. The settings in GoDaddy look something like the following: A (Host) Host Points to @ ip address of mail1 41.x.x.x mail1 ip address of mail1 41.x.x.x mail2 ip address of mail2 196.x.x.x MX Priority host points to 10 @ mail1.mydomain.com 20 @ mail2.mydomain.com When mail1 goes down, mail2 is able to get emails. I can access it through the browser with no problem, but I want my users to able to pop3/smtp as well without changing anything in their outlook. I dont want any impact to the users when mail1 is down. Also, I'm using the windows server DFS to keep both folders of the mails in sync. Is this the right way, or should I be using something else?

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• Windows VPN not authenticating from ADSL to Wireless link

  - by deanvz

  I have a normal windows VPN on a computer connecting to a 196.201.x.x/24 IP. If this VPN tries to connect from any address in the 41.x.x.x range it cant get there. The server is a normal windows 2008 server, running exchange with a PPPoE IP natted to a public IP on the public gateway of the wireless network as the server is on site and its connectivity is derived from Mikrotik RB's. The computer on the 41 range can traceroute and ping the server, but the VPN does not authenticate. When on the network or any other, the VPN works fine. Is there something that could be configured on the VPN client? All firewall settings of a standard ADSL router have been checked and found to block only ICMP's. Is this a VPN configuration problem or a network issue?

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• Multiple VLANs on a single subnet

  - by mstaessen

  I would like to establish the setup shown below. The image is taken from (http://gcharriere.com/blog/?p=620) and explains how to set this up on a brocade device. I would like to use an ubuntu server to do the routing. Right now, the switch and the server/router are connected with a trunk and the server uses the vlan package, kernel module and (inner) subnets for routing. I would like that: no IP addresses get lost in the subnetting (outer subnet is /26, inner subnets are /28) I don't want the rigorous subdivision of my outer subnet. I want to assign a VLAN to any IP in the outer subnet. How do I need to configure my interfaces? What is the "ubuntu" translation of "ip follow ve"? Thanks!

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• Distribute outgoing connections among multiple IPs configured on the same NIC

  - by cedivad

  I have a NIC with 2 aliases on it. The network interface has 3 IPs configured on it. Think about it like this: i can ping the same server by hitting .100 .101 and .102. I want the source address of the outgoing connections to be distributed among these ip. So if i have 3 opened connections, one connection will have result as having an IP address ending with .100, the other two should result as having as ip addresses .101 and .102. I'm using FreeBSD but I think this question to be Linux-Like wide.

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• Client can't reach my production webserver. It's their ISP's fault, but now what?

  - by MikeN

  I have a customer in Michigan who can't access my production SaaS webserver that is hosted on Slicehost. All other companies across the US/Canada/Europe have no problem reaching the site. This problem is occuring intermittantly, and Slicehost customer service says it's a problem with the client's ISP. I got the IP address of my client, and ping'ing that IP address from my PROD server fails, but ping'ing the IP address from my dev box or our seperate blog server (also hosted on slicehost) works. How do I debug a problem like this? I asked the client to reach out to their local ISP and ask about this problem. A traceroute shows that the packets are getting stopped on a Comcast Michigan node which is the client's ISP. Is there anything I can do additionally to fix this problem for my client?

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• Amazon EC2 - Unable to connect to MySQL

  - by alexus

  I'm having issue connecting from one VM to another # nmap -p3306 ip-XX-XX-XX-XX.ec2.internal Starting Nmap 6.40 ( http://nmap.org ) at 2014-06-10 17:50 EDT Nmap scan report for ip-XX-XX-XX-XX.ec2.internal (XX.XX.XX.XX) Host is up (0.000033s latency). PORT STATE SERVICE 3306/tcp closed mysql Nmap done: 1 IP address (1 host up) scanned in 1.05 seconds # in my Security Group I allowed Inbound connectivity via port TCP, portrange 3306 and Source 0.0.0.0/0, so theoratically it should work, but in reality it doesn't( I'm running red hat enterprise linux 7 on both VMs. mariadb.service running fine on another VM and I am able to connect to it locally. DB's: # netstat -anp | grep 3306 tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 2324/mysqld # iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination # Any ideas what else I missed?

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• Ways to do simple failover with one server and two IPs

  - by CrassHoppr

  The setup is one server (Windows 2008) at one location with two incoming connections. As the server has to interface with various on-site devices, and will have a small number of incoming connections, a data center is not an option, and instead cable/dsl connections must be used. The goal is that users visit https://service.site.com and are sent to either the primary IP address or a secondary IP if the primary is down. I've seen advice to use round robin DNS for this, but caching an IP for a downed interface is something I'd like to avoid. Is something like this possible with these constraints?

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• Configuring Wireless Network

  - by Vinod K

  I have vyataa router on VMware with 2 interfaces eth0 and eth1 eth0 is facing the internet eth0 is in Nat mode with dhcp on eth1 is in bridged mode with my ethernet with ip 10.0.2.34/24 The ethernet card is at ip 10.0.2.95/24 i have defined the nat rule. Hence internet is available at eth1 too. Now i am connecting a wireless router at "eth1" iball router, I have connected the router using a cable to the ethernet interface of my laptop. I have configured the WAN connection type as "Static IP" and given "10.0.2.34/24" All the clients that connect using wireless router cannot connect to the internet though. Could anyone provide me a solution for this.. Thank You!!

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