ping and host
This is a discussion on ping and host within the Linux Networking forums, part of the Linux Forums category; I have the hereafter results regarding ping and host. Fine for 'ping' but what does 'host' return means ? [root@pc34ghz ~]# ...
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09-04-2005
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ping and host
I have the hereafter results regarding ping and host.
Fine for 'ping' but what does 'host' return means ? [root@pc34ghz ~]# ping www.google.com PING www.l.google.com (216.239.59.99) 56(84) bytes of data. 64 bytes from 216.239.59.99: icmp_seq=0 ttl=237 time=35.6 ms 64 bytes from 216.239.59.99: icmp_seq=1 ttl=237 time=35.6 ms [root@pc34ghz ~]# host www.google.com www.google.com is an alias for www.l.google.com. www.l.google.com has address 216.239.59.147 www.l.google.com has address 216.239.59.99 www.l.google.com has address 216.239.59.104 www.l.google.com has address 216.239.59.103 ;; Warning: Message parser reports malformed message packet. ;; connection timed out; no servers could be reached Cheers, Bruno 
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09-04-2005
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Re: ping and host
On Sun, 04 Sep 2005 22:28:05 +0200, Bruno Costacurta wrote:
> I have the hereafter results regarding ping and host. > Fine for 'ping' but what does 'host' return means ? > > [root@pc34ghz ~]# ping www.google.com > PING www.l.google.com (216.239.59.99) 56(84) bytes of data. > 64 bytes from 216.239.59.99: icmp_seq=0 ttl=237 time=35.6 ms > 64 bytes from 216.239.59.99: icmp_seq=1 ttl=237 time=35.6 ms > > [root@pc34ghz ~]# host www.google.com > www.google.com is an alias for www.l.google.com. > www.l.google.com has address 216.239.59.147 > www.l.google.com has address 216.239.59.99 > www.l.google.com has address 216.239.59.104 > www.l.google.com has address 216.239.59.103 > ;; Warning: Message parser reports malformed message packet. > ;; connection timed out; no servers could be reached guessing an overloaded DNS server or realy bad connection somewhere. host www.google.com www.google.com is an alias for www.l.google.com. www.l.google.com has address 64.233.161.147 www.l.google.com has address 64.233.161.99 www.l.google.com has address 64.233.161.104 www.google.com is an alias for www.l.google.com. www.google.com is an alias for www.l.google.com. check each dns server cat /etc/resolv.conf host www.google.com dns_ip_here_to_test or dig www.google.com dns_ip_here_to_test
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09-05-2005
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Re: ping and host
Bit Twister wrote:
> On Sun, 04 Sep 2005 22:28:05 +0200, Bruno Costacurta wrote: >> I have the hereafter results regarding ping and host. >> Fine for 'ping' but what does 'host' return means ? >> >> [root@pc34ghz ~]# ping www.google.com >> PING www.l.google.com (216.239.59.99) 56(84) bytes of data. >> 64 bytes from 216.239.59.99: icmp_seq=0 ttl=237 time=35.6 ms >> 64 bytes from 216.239.59.99: icmp_seq=1 ttl=237 time=35.6 ms >> >> [root@pc34ghz ~]# host www.google.com >> www.google.com is an alias for www.l.google.com. >> www.l.google.com has address 216.239.59.147 >> www.l.google.com has address 216.239.59.99 >> www.l.google.com has address 216.239.59.104 >> www.l.google.com has address 216.239.59.103 >> ;; Warning: Message parser reports malformed message packet. >> ;; connection timed out; no servers could be reached > > guessing an overloaded DNS server or realy bad connection somewhere. > > host www.google.com > www.google.com is an alias for www.l.google.com. > www.l.google.com has address 64.233.161.147 > www.l.google.com has address 64.233.161.99 > www.l.google.com has address 64.233.161.104 > www.google.com is an alias for www.l.google.com. > www.google.com is an alias for www.l.google.com. > > check each dns server > cat /etc/resolv.conf > > host www.google.com dns_ip_here_to_test > or > dig www.google.com dns_ip_here_to_test But the DNS looks fine. In fact they're working on my previous config wich is an ADSL modem. Now I just installed a Wireless modem router (using same DNS) but received the herebefore problems. I cannot see why same DNS produce different results.
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09-05-2005
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Re: ping and host
> I have the hereafter results regarding ping and host.
> Fine for 'ping' but what does 'host' return means ? > > [root@pc34ghz ~]# ping www.google.com > PING www.l.google.com (216.239.59.99) 56(84) bytes of data. > 64 bytes from 216.239.59.99: icmp_seq=0 ttl=237 time=35.6 ms > 64 bytes from 216.239.59.99: icmp_seq=1 ttl=237 time=35.6 ms > > [root@pc34ghz ~]# host www.google.com > www.google.com is an alias for www.l.google.com. > www.l.google.com has address 216.239.59.147 > www.l.google.com has address 216.239.59.99 > www.l.google.com has address 216.239.59.104 > www.l.google.com has address 216.239.59.103 > ;; Warning: Message parser reports malformed message packet. > ;; connection timed out; no servers could be reached > > Cheers, > Bruno Hi, perhaps it is a "DNS-loadbalancing" ? greetings ruediger
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09-05-2005
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Re: ping and host
Ruediger Grimm wrote:
>> I have the hereafter results regarding ping and host. >> Fine for 'ping' but what does 'host' return means ? >> >> [root@pc34ghz ~]# ping www.google.com >> PING www.l.google.com (216.239.59.99) 56(84) bytes of data. >> 64 bytes from 216.239.59.99: icmp_seq=0 ttl=237 time=35.6 ms >> 64 bytes from 216.239.59.99: icmp_seq=1 ttl=237 time=35.6 ms >> >> [root@pc34ghz ~]# host www.google.com >> www.google.com is an alias for www.l.google.com. >> www.l.google.com has address 216.239.59.147 >> www.l.google.com has address 216.239.59.99 >> www.l.google.com has address 216.239.59.104 >> www.l.google.com has address 216.239.59.103 >> ;; Warning: Message parser reports malformed message packet. >> ;; connection timed out; no servers could be reached >> >> Cheers, >> Bruno > > Hi, > > perhaps it is a "DNS-loadbalancing" ? > > greetings > ruediger > > Why do you mean by a "DNS-loadbalancing" ? However the problem I mentioned here appears with a Wireless ADSL Router. I never had these problems with my previous modem (and same DSN settings).
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09-06-2005
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Re: ping and host
Bruno Costacurta wrote:
> Ruediger Grimm wrote: > > >>>I have the hereafter results regarding ping and host. >>>Fine for 'ping' but what does 'host' return means ? >>> >>>[root@pc34ghz ~]# ping www.google.com >>>PING www.l.google.com (216.239.59.99) 56(84) bytes of data. >>>64 bytes from 216.239.59.99: icmp_seq=0 ttl=237 time=35.6 ms >>>64 bytes from 216.239.59.99: icmp_seq=1 ttl=237 time=35.6 ms >>> >>>[root@pc34ghz ~]# host www.google.com >>>www.google.com is an alias for www.l.google.com. >>>www.l.google.com has address 216.239.59.147 >>>www.l.google.com has address 216.239.59.99 >>>www.l.google.com has address 216.239.59.104 >>>www.l.google.com has address 216.239.59.103 >>>;; Warning: Message parser reports malformed message packet. >>>;; connection timed out; no servers could be reached >>> >>>Cheers, >>>Bruno >> >>Hi, >> >>perhaps it is a "DNS-loadbalancing" ? >> >>greetings >>ruediger >> >> > > > Why do you mean by a "DNS-loadbalancing" ? > > However the problem I mentioned here appears with a Wireless ADSL > Router. I never had these problems with my previous modem (and same DSN > settings). This isnt a "problem" at all - It looks to me as if it's all working okay. DNS load balancing means (in this case) that google have defined more than one IP address for the www.l.google.com host. The idea being that clients will choose one of the supplied IPs at random - so the "load" on the servers is evenly distributed. The reason you see different results with different routers will be because of the routers internal DNS servers' different behaviours. I presume you have configured the ADSL router as the DNS server for your workstations, or that DHCP is doing this for you - yes? The wireless ADSL router is giving you all the IPs returned by the "real world" DNS servers, but your previous modem was making it's own random choice, and giving you just that one IP. Both approaches are okay, although the old modem isnt playing the whole game. Chris -- Using linux, IpTables and Rope to filter P2P and other complex protocols.. http://www.lowth.com/rope
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09-06-2005
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Re: ping and host
>>>Hi,
>>> >>>perhaps it is a "DNS-loadbalancing" ? >>> >>>greetings >>>ruediger >>> >> >> Why do you mean by a "DNS-loadbalancing" ? >> >> However the problem I mentioned here appears with a Wireless ADSL >> Router. I never had these problems with my previous modem (and same DSN >> settings). > > This isnt a "problem" at all - It looks to me as if it's all working okay. > > DNS load balancing means (in this case) that google have defined more > than one IP address for the www.l.google.com host. The idea being that > clients will choose one of the supplied IPs at random - so the "load" on > the servers is evenly distributed. > > The reason you see different results with different routers will be > because of the routers internal DNS servers' different behaviours. > > I presume you have configured the ADSL router as the DNS server for your > workstations, or that DHCP is doing this for you - yes? > > The wireless ADSL router is giving you all the IPs returned by the "real > world" DNS servers, but your previous modem was making it's own random > choice, and giving you just that one IP. Both approaches are okay, > although the old modem isnt playing the whole game. > > Chris > > -- > Using linux, IpTables and Rope to filter P2P and other complex > protocols.. http://www.lowth.com/rope Indeed you're right. I tried another ADSL router and received same time out, but in this case, browsing is working fine. So I have to look in another direction for the problem I still have with a not working efficiently router D-Link DSL-G604T.
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09-18-2005
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Re: ping and host
Bruno Costacurta wrote:
>>>>Hi, >>>> >>>>perhaps it is a "DNS-loadbalancing" ? >>>> >>>>greetings >>>>ruediger >>>> >>> >>> Why do you mean by a "DNS-loadbalancing" ? >>> >>> However the problem I mentioned here appears with a Wireless ADSL >>> Router. I never had these problems with my previous modem (and same DSN >>> settings). >> >> This isnt a "problem" at all - It looks to me as if it's all working >> okay. >> >> DNS load balancing means (in this case) that google have defined more >> than one IP address for the www.l.google.com host. The idea being that >> clients will choose one of the supplied IPs at random - so the "load" on >> the servers is evenly distributed. >> >> The reason you see different results with different routers will be >> because of the routers internal DNS servers' different behaviours. >> >> I presume you have configured the ADSL router as the DNS server for your >> workstations, or that DHCP is doing this for you - yes? >> >> The wireless ADSL router is giving you all the IPs returned by the "real >> world" DNS servers, but your previous modem was making it's own random >> choice, and giving you just that one IP. Both approaches are okay, >> although the old modem isnt playing the whole game. >> >> Chris >> >> -- >> Using linux, IpTables and Rope to filter P2P and other complex >> protocols.. http://www.lowth.com/rope > > Indeed you're right. > I tried another ADSL router and received same time out, but in this case, > browsing is working fine. > So I have to look in another direction for the problem I still have with a > not working efficiently router D-Link DSL-G604T. > Finally it's working : MTU value was incorrect. Checking using another working wireless router ADSL I found that MTU was updated after an ISP probing with different value. As I setup the correct value on previous non-working D-Link for the MTU (1458 versus 1500 in my case) everything works fine. Bruno
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