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  • How to transition to Comcast with static IP address [migrated]

    - by steveha
    I have my own email server in my house, on a static IP address. I have had business DSL for over a decade, but I also now have Comcast business Internet. I want to transition from the DSL to the Comcast, and I have some questions. I have a domain name, my own mail server, and a firewall (a PC with two network interfaces, running Devil-Linux). I need to make sure I understand how to set up the Comcast cable box, and how to set up my firewall. First, do I need to change any settings in the cable box? Currently I have only used the cable box by plugging in a laptop, with the laptop doing DHCP. I think I can leave the box alone but I would like to make sure. Second, I'm not sure I understand the instructions Comcast gave me for setting up the firewall. My DSL provider gave me the following information: static IP address, net mask, gateway, and two DNS servers. Comcast gave me: static IP address, routable static IP address, net mask, and two DNS servers, and told me to put the "static IP address" as the "gateway" on the firewall. Is this just Comcast-speak here? Does "routable static IP address" mean the same thing as "static IP address" in my DSL setup, the end-point address that I should publish in the DNS MX records for my email server? Or should I publish the "static IP address", and Comcast will then route all its traffic over the cable box? My plan is: first, I'm going to configure another firewall, so I have one firewall for the DSL and one for the Comcast (rather than madly editing settings to switch back and forth). Then I will publish the new Comcast static IP address as a backup email server address in the DNS MX records, wait a while to let it propagate, and then switch my home over from the DSL to the Comcast. Then I'll change DNS to make that the primary mail address and the DSL the secondary, let that go a while and make sure it seems reliable. Then I'll remove the DSL from the DNS MX records completely, and finally shut down the DSL service. (I thought about keeping the DSL as a backup, but the reason I'm leaving DSL is that it has become unreliable; and I have heard that Comcast business Internet is reliable.) Final question, any advice for me? Anything you think might be useful, helpful, or educational. Thanks.

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  • Internet speed is suddenly slow only on my laptop, but it's normal in other devices

    - by Wael
    I have a TP-Link router connected to a ZTE modem, with 2 laptops, a tablet, 2 phones connected via the router's WiFi, and an additional desktop connected via ethernet to the router. Today, my laptop started to have a very slow connection to the internet, which at first I thought it was the operator's problem to find out later on that it works fine on other devices. I tried to connect directly via WiFi to the modem, but it was as slow. I cannot access facebook at all, google takes forever to do a search, and youtube barely works. The weird thing though, is that when youtube does work, the streaming is full speed. This happens also when I download a file! My browse is Firefox, but I used Chrome and IE9 with the same results. I work on Windows 7 Thanks for any advices.

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  • iptables (NAT/PAT) setup for SSH & Samba

    - by IanVaughan
    I need to access a Linux box via SSH & Samba that is hidden/connected behind another one. Setup :- A switch B C |----| |---| |----| |----| |eth0|----| |----|eth0| | | |----| |---| |eth1|----|eth1| |----| |----| Eg, SSH/Samba from A to C How does one go about this? I was thinking that it cannot be done via IP alone? Or can it? Could B say "hi on eth0, if your looking for 192.168.0.2, its here on eth1"? Is this NAT? This is a large private network, so what about if another PC has that IP?! More likely it would be PAT? A would say "hi 192.168.109.15:1234" B would say "hi on eth0, traffic for port 1234 goes on here eth1" How could that be done? And would the SSH/Samba demons see the correct packet header info and work?? IP info :- A - eth0 - 192.168.109.2 B - eth0 - B1 = 192.168.109.15 B2 = 172.24.40.130 - eth1 - 192.168.0.1 C - eth1 - 192.168.0.2 A, B & C are RHEL (RedHat) But Windows computers can be connected to the switch. I configured the 192.168.0.* IPs, they are changeable. Update after response from Eddie Few problems (and Machines' B IP is different!) From A :- ssh 172.24.40.130 works ok, (can get to B2) but ssh 172.24.40.130 -p 2022 -vv times out with :- OpenSSH_4.3p2, OpenSSL 0.9.8e-fips-rhel5 01 Jul 2008 debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug2: ssh_connect: needpriv 0 debug1: Connecting to 172.24.40.130 [172.24.40.130] port 2022. ...wait ages... debug1: connect to address 172.24.40.130 port 2022: Connection timed out ssh: connect to host 172.24.40.130 port 2022: Connection timed out From B2 :- $ service iptables status Table: filter Chain INPUT (policy ACCEPT) num target prot opt source destination Chain FORWARD (policy ACCEPT) num target prot opt source destination 1 ACCEPT tcp -- 0.0.0.0/0 192.168.0.2 tcp dpt:22 Chain OUTPUT (policy ACCEPT) num target prot opt source destination Table: nat Chain PREROUTING (policy ACCEPT) num target prot opt source destination 1 DNAT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:2022 to:192.168.0.2:22 Chain POSTROUTING (policy ACCEPT) num target prot opt source destination Chain OUTPUT (policy ACCEPT) num target prot opt source destination And ssh from B2 to C works fine :- $ ssh 192.168.0.2 Route info :- $ route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.0.0 * 255.255.255.0 U 0 0 0 eth1 172.24.40.0 * 255.255.255.0 U 0 0 0 eth0 169.254.0.0 * 255.255.0.0 U 0 0 0 eth1 default 172.24.40.1 0.0.0.0 UG 0 0 0 eth0 $ ip route 192.168.0.0/24 dev eth1 proto kernel scope link src 192.168.0.1 172.24.40.0/24 dev eth0 proto kernel scope link src 172.24.40.130 169.254.0.0/16 dev eth1 scope link default via 172.24.40.1 dev eth0 So I just dont know why the port forward doesnt work from A to B2?

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  • change from bash shell prompt to regular shell prompt on centos

    - by user881480
    my centos environment has just become bash shell prompt: -bash-3.2# how do I change it back to the usual # prompt? what places should I check for possibly modifications? Update: I was not clear in my question: the prompt used to be just a single # and supports more syntax(a different shell script than bash 3.2 perhaps)? I would like to switch back to that. for example, ll is not longer supported in this bash shell

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  • How to configure wpa_supplicant on RHEL6?

    - by Yang Jy
    I am running a version of RHCE6 on my laptop. I uninstalled the default NetworkManager in order that I could configure the network all in the command line. The Ethernet part is okay, but I have problem bringing up the wireless interface. What I got is: Bringing up interface wlan0: Determining IP information for wlan0... failed; no link present. Check cable? I did exactly what this article says. I am not sure if it is because the article is obsolete or something else. Please help.

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  • How to get my external IP address(over NAT) from Windows command-line?

    - by Diogo Rocha
    Windows "ipconfig" command can only show me the parameters from the ethernet interfaces from my machine(even with the "ipconfig /all" argument), it can show detailed information about the interface, but will never show me my external IP address over a NAT network. However, there are several websites, such as "What is my IP" that can get and show my external IP addres. So I'm wondering, if is possible to get this value externally, should I expect that there is some way to get this information from a command line at my local machine... I need to get this value to log on an application that I'm doing with VB Script. There is some way to do this, from a "cmd" on Windows?

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  • Can't set-up Wifi Adhoc on my Raspberry Pi with an USB dongle

    - by Wouter
    I am trying to set-up an access point (ad-hoc) for my Raspberry Pi. That means I'm trying to "share" the ethernet connection over Wi-Fi. I am doing this using my Ralink Technology, Corp. RT2501/RT2573 Wireless Adapter. When following a tutorial (or actually every tutorial), it immediately goes wrong. root@pinkypi:/home/pi# iwconfig wlan0 mode ad-hoc Error for wireless request "Set Mode" (8B06) : SET failed on device wlan0 ; Device or resource busy. I already tried ifdown and not having it in the USB port at the startup. If it helps, every action with the thing fail (or at least setting the mode). I am using Debian. I'm sure I'm overseeing something, but I can't find out what. What is wrong?

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  • Share Pc' s wifi internet connection to router and spit it out trough it

    - by Maken
    Basicly im trying to share the an internet connection that i receive through wifi from my bestfriend's place to my place and Extend it trough a router for my consoles and other computers in my household i have 1 pc with Wifi /Ethernet , one router "DD-wrt"ed" Schema is like this Internet -----Modem------- (Friend's)Router -----to my PC through Wifi (Ics)---- to Router(2) through lan----- to Computer 1 (over lan or wifi etc...) ------ Computer 2 (over lan or wifi etc...) i want the computer 1 and 2 to have internet from Router(2) if its not clear enough il try to give more details but a little help would be greatly appreciated

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  • Can't install new database in OpenLDAP 2.4 with BDB on Debian

    - by Timothy High
    I'm trying to install an openldap server (slapd) on a Debian EC2 instance. I have followed all the instructions I can find, and am using the recommended slapd-config approach to configuration. It all seems to be just fine, except that for some reason it can't create my new database. ldap.conf.bak (renamed to ensure it's not being used): ########## # Basics # ########## include /etc/ldap/schema/core.schema include /etc/ldap/schema/cosine.schema include /etc/ldap/schema/nis.schema include /etc/ldap/schema/inetorgperson.schema pidfile /var/run/slapd/slapd.pid argsfile /var/run/slapd/slapd.args loglevel none modulepath /usr/lib/ldap # modulepath /usr/local/libexec/openldap moduleload back_bdb.la database config #rootdn "cn=admin,cn=config" rootpw secret database bdb suffix "dc=example,dc=com" rootdn "cn=manager,dc=example,dc=com" rootpw secret directory /usr/local/var/openldap-data ######## # ACLs # ######## access to attrs=userPassword by anonymous auth by self write by * none access to * by self write by * none When I run slaptest on it, it complains that it couldn't find the id2entry.bdb file: root@server:/etc/ldap# slaptest -f ldap.conf.bak -F slapd.d bdb_db_open: database "dc=example,dc=com": db_open(/usr/local/var/openldap-data/id2entry.bdb) failed: No such file or directory (2). backend_startup_one (type=bdb, suffix="dc=example,dc=com"): bi_db_open failed! (2) slap_startup failed (test would succeed using the -u switch) Using the -u switch it works, of course. But that merely creates the configuration. It doesn't resolve the underlying problem: root@server:/etc/ldap# slaptest -f ldap.conf.bak -F slapd.d -u config file testing succeeded Looking in the database directory, the basic files are there (with right ownership, after a manual chown), but the dbd file wasn't created: root@server:/etc/ldap# ls -al /usr/local/var/openldap-data total 4328 drwxr-sr-x 2 openldap openldap 4096 Mar 1 15:23 . drwxr-sr-x 4 root staff 4096 Mar 1 13:50 .. -rw-r--r-- 1 openldap openldap 3080 Mar 1 14:35 DB_CONFIG -rw------- 1 openldap openldap 24576 Mar 1 15:23 __db.001 -rw------- 1 openldap openldap 843776 Mar 1 15:23 __db.002 -rw------- 1 openldap openldap 2629632 Mar 1 15:23 __db.003 -rw------- 1 openldap openldap 655360 Mar 1 14:35 __db.004 -rw------- 1 openldap openldap 4431872 Mar 1 15:23 __db.005 -rw------- 1 openldap openldap 32768 Mar 1 15:23 __db.006 -rw-r--r-- 1 openldap openldap 2048 Mar 1 15:23 alock (note that, because I'm doing this as root, I had to also change ownership of some of the files created by slaptest) Finally, I can start the slapd service, but it dies in the attempt (text from syslog): Mar 1 15:06:23 server slapd[21160]: @(#) $OpenLDAP: slapd 2.4.23 (Jun 15 2011 13:31:57) $#012#011@incagijs:/home/thijs/debian/p-u/openldap-2.4.23/debian/build/servers/slapd Mar 1 15:06:23 server slapd[21160]: config error processing olcDatabase={1}bdb,cn=config: Mar 1 15:06:23 server slapd[21160]: slapd stopped. Mar 1 15:06:23 server slapd[21160]: connections_destroy: nothing to destroy. I manually checked the olcDatabase={1}bdb file, and it looks fine to my amateur eye. All my specific configs are there. Unfortunately, syslog isn't reporting a specific error in this case (if it were a file permission error, it would say). I've tried uninstalling and reinstalling slapd, changing permissions, Googling my wits out, but I'm tapped out. Any OpenLDAP genius out there would be greatly appreciated!

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  • Our wi-fi at work is ridiculously slow, will adding more range extenders improve it?

    - by john
    At work, we have two wireless networks (e.g., Work1 Work2); the Work2 is used downstairs and Work1 is used upstairs. However, both are notoriously slow. The connection is better when we are wired in, but unfortunately due to our building being very old and our company growing very fast, most employees are not seated near the walls where the ethernet cables are. I had Cox, our ISP, run a bandwidth utilization test and it doesn't seem like we are capping out on upstream/downstream, which leads me to believe that it's strictly an issue with the wireless networks (which were implemented before I got there). The wireless networks are both Apple Airport Extremes. Is there anything I can do to improve the situation for everyone? Speeds are extremely slow, and sometimes drops out.

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  • Virtual LTSP server with KVM

    - by phil
    I want to setup a kvm-based LTSP appliance with Ubuntu 10.04 (server/desktop for ltsp) on a Dell PowerEdge 2900 for ~10-15 clients. People will mostly use Firefox, Thunderbird, OpenOffice and Qcad. Does someone have any experience with this setup? I've had a similar setup with VMware Server 2 and Ubuntu 8.04. How good/bad is kvm compared to VMware for a LTSP appliance? Shall I stick with VMware or can I switch to KVM?

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  • Wireless network not working Linux Mint

    - by zharvey
    I have a home LAN that I am confident is working properly (I have a Windows 7 and an Ubuntu Desktop machine that both see the router and a working Internet connection). I just installed Linux Mint (Maya) on a new machine and although I can connect to the Internet via a wired (ethernet) connection, it does not see my wireless network. In fact, as you can see in the screenshot below, it doesn't even look like it has the drivers to be able to detect a wireless network... I have ran update manager and made sure that I am up-to-date with everything and have restarted. Any ideas here?!?

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  • Login configuration script for Junos EX 2200 using minicom

    - by liv2hak
    I am connecting to Junos OS on Juniper EX-2200 switches using minicom as shown below minicom -C log_sw1 sw1 Now I have a series of commands that I need to execute on sw1.(example shown below) cli request system zeroize show config show interface edit delete protocols set system arp aging-timer 240 I want to avoid having to type these commands every time I log into the system.I want to put them in a config file and I want the it to be execute every time I log into the switch using minicom. Is there any way I can achieve this?

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  • How can I setup a subnetwork using DDWRT and a 2Wire?

    - by MadBurn
    Ok, I'm having a bit of trouble getting this setup. I'm not really sure what direction I need to be looking in. I am on ATT UVerse and I have to use their horrible 2Wire Modem/Router. But with this router, I have very limited control over my network and my wifi range is too small for my house. But, I have a hardwire ran to my TV which I have hooked into a switch and split the line to my PS3. The problem I'm having, is I don't know how to get the Buffalo DD-WRT setup as a subnetwork so that the PS3 can find my Media Server. Here is a diagram of what I'm trying to accomplish: Blue is ethernet.

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  • VM can’t connect to outside in bridged mode

    - by Kamal
    Hi Guys, I am not able to ping any machine(not even the host) from Guest VM in bridged mode. But I got an IP which is on the same subnet as host. I can ping my guest VM from the host and can use ssh to connect to the guest. I am using Vmware workstation 6.5. Guest VM is a centos VM and host is windows xp. Every thing works fine in NAT mode. Any clues as to what could be happening. I tried disabling all the firewalls I have. My virtual network editor shows that my ethernet adapter(the one my host uses) is used for bridging. It is connected. I don't understand how I can get an IP address from DHCP server. I can't ping any of the DNS servers in generated /etc/resolv.conf which are the same as that of my host

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  • How to know my wireless card has injection enabled?

    - by shrimpy
    I am playing around with aircrack. And was trying to see whether my wireless card on my laptop can pass the injection test And I end up seeing the following... does it mean my wireless card is not able to run aircrack? root@myubuntu:/home/myubuntu# iwconfig lo no wireless extensions. eth0 no wireless extensions. eth1 IEEE 802.11bg ESSID:"" Nickname:"" Mode:Managed Frequency:2.437 GHz Access Point: Not-Associated Bit Rate:54 Mb/s Tx-Power:24 dBm Retry min limit:7 RTS thr:off Fragment thr:off Power Management:off Link Quality=5/5 Signal level=0 dBm Noise level=-57 dBm Rx invalid nwid:0 Rx invalid crypt:781 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:0 Missed beacon:0 root@myubuntu:/home/myubuntu# aireplay-ng -9 eth1 ioctl(SIOCSIWMODE) failed: Invalid argument ARP linktype is set to 1 (Ethernet) - expected ARPHRD_IEEE80211, ARPHRD_IEEE80211_FULL or ARPHRD_IEEE80211_PRISM instead. Make sure RFMON is enabled: run 'airmon-ng start eth1 <#>' Sysfs injection support was not found either. root@myubuntu:/home/myubuntu#

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  • Setup link aggregation and jumbo frames on VMware ESXi 4

    - by Sysadminicus
    I'm setting up an ESXi 4 server to connect to an NFS datastore. I'd like to bond two of the NICs together and use jumbo frames for the NFS connection on a private (non-management) network. I setup a new switch with the 2 NICs and am able to connect to the NFS share over it, but could use some guidance on getting jumbo frames and link aggregation/bonding/teaming working.

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  • How do I make my blu-ray/hd-dvd/dvd drive multi-region?

    - by jammus
    I have a combined dvd/hd-dvd/bd drive on my machine (yeah, I'm very much the big man) which is all great and everything. However, I've got quite a few region 1 DVDs (on import, yeah?) that it won't play. I know I can switch my drive's region but this is limited to 5 times only. Is there a way I can make the drive permanently multi-region or lift this limit, the same way you can with most DVD players?

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  • iMac G5 20" (First All-In-One White Screen) Cannot Connect To Internet

    - by Goober
    The Scenario I've got an iMac G5 20" (First All-In-One White Screen) PPC. It has an Airport Extreme Network card in order to wirelessly to connect to the internet. For the most part I connect using ethernet as opposed to wirelessly, but recently have had the need to connect using the wireless. The Hardware BT Home Broadband Wireless Router. iMac G5 20" From about 5 years ago (First All-In-One White Screen) The Issue Even though I know for a fact that It has connected to the internet wireslessly in the past, for some reason it can discover the wireless router, but upon entering the password it fails to connect. I have tried multiple times to no avail. I have 2 other Mac's on the network and a pc that can all connect wirelessly. However both the mac's. Question Any ideas as to why my really old iMac G5 can't connect wirelessly anymore!?

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  • Wireless Access Point - Can't ping other machines on the wireless network

    - by Surfer513
    I have a wireless access point (Netgear), and I have it setup so that it has an IP address in the current subnet (let's say 192.168.2.0, subnet mask of 255.255.255.0). The machine that it is connected to via ethernet cable has an IP in the same subnet as the AP. The machines that are connected to the AP via the wireless connection also have an IP address in the same subnet as the rest of the network (192.168.2.0). All machines can ping the access point, but they cannot ping each other. I don't totally understand why, because there is connection and all of the machines are in the same subnet. I realize this is a layer 3 device, but is there an issue because of this AP's lack of gateway capabilities? (i.e. no routing table, etc.)

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  • Using airport extreme base station as a wireless G to wireless N bridge

    - by micmcg
    Due to unfortunate placement of various wall outlets in my new apartment, my adsl 2 modem + router is not able to be placed next to my airport extreme base station (AEBS). I'd prefer not to run cat5 cable between them, but I still want to use the wireless N on the AEBS, because it will have a high speed NAS plugged in via gigabit ethernet so I want to maximise the wireless transfer speed to my 27" iMac. Is it possible to use one of the radios in the airport extreme to bridge the wireless G network with the router, and the wireless N radio to broadcast normally? The only traffic going over the G network should be internet (24mbps ADSL2) so it should never get saturated. Thanks

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  • Problem Assigning Static IP to CentOS Server

    - by nategood
    We have a sandbox server running CentOS that we run inside our office. Our ISP has assigned us a block of 5 static IPs. We now want to assign it a static IP. DEVICE=eth0 BOOTPROTO=none # have also tried "static" here HWADDR=00:13:72:*:*:* ONBOOT=yes TYPE=Ethernet NETMASK=255.255.255.0 IPADDR=173.*.*.161 GATEWAY=10.1.10.1 /etc/resolv.cnf is also set with the appropriate name servers from our ISP. When I ifdown eth0 then ifup eth0 I get... SIOCADDRT: Network is unreachable When I switch to DCHP, the machine has an IP assigned and there are no connection problems. Any ideas?

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  • Why would sshd allow root logins by default?

    - by The Journeyman geek
    I'm currently working on hardening my servers against hacking- amongst other things, i'm getting a load of attempts to log on as root over ssh. While i've implemented fail2ban, i'm wondering, why root logons would be allowed by default to start with? Even with non sudo based distros, i can always log on as a normal user and switch - so i'm wondering is there any clear advantage to allowing root logons on ssh, or it just something no one bothers to change?

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