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I can't ping my server from certain IP
The 2019 Stack Overflow Developer Survey Results Are Inping/ssh networking problem with server from 1 particular windows xp laptopMy server is working fine, but I can't ping itPing a Specific PortCommand line tools for ping HTTP?Linux server cannot be pingedServer can't ping or connect to selfI am not able to connect to my server from my leased line internet connectionLinux router: ping responses going through the wrong interfaceFluctuating ping to a certain ISP backbonePing times change over time only to a certain server
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I have 2 internet connections from 2 different ISPs with static IPs, lets call them A and B. A connects to the server in several ways (ping, SSH, HTTP), while B cannot do anything (ping, SSH, HTTP).
I ran tcpdump on the server using connection A, and then tried to call a webpage using B. It appears that B has reached the server, so that rules out that the problem is from ISP B.
I checked the iptables but there is nothing that bans B ip! I checked hosts.deny file as well but there is nothing in it too.
What might be the problem? Is there any more tests that would help in reaching to the problem source?
Please advice
fedora linux-networking ping connection
asked Mar 21 '13 at 15:42
wael34218wael34218
2062413
add a comment |
I have 2 internet connections from 2 different ISPs with static IPs, lets call them A and B. A connects to the server in several ways (ping, SSH, HTTP), while B cannot do anything (ping, SSH, HTTP).
I ran tcpdump on the server using connection A, and then tried to call a webpage using B. It appears that B has reached the server, so that rules out that the problem is from ISP B.
I checked the iptables but there is nothing that bans B ip! I checked hosts.deny file as well but there is nothing in it too.
What might be the problem? Is there any more tests that would help in reaching to the problem source?
Please advice
fedora linux-networking ping connection
asked Mar 21 '13 at 15:42
wael34218wael34218
2062413
1
It's obviously a routing problem on the server, probably you have A's gateway set as the default (even for B).
– NickW
Mar 21 '13 at 15:48
1
Have you properly configured with the server with two routing tables (one for each ISP) and a policy rule to select between them based on the source IP? If not, it can't possibly work.
– David Schwartz
Mar 21 '13 at 15:49
add a comment |
I have 2 internet connections from 2 different ISPs with static IPs, lets call them A and B. A connects to the server in several ways (ping, SSH, HTTP), while B cannot do anything (ping, SSH, HTTP).
I ran tcpdump on the server using connection A, and then tried to call a webpage using B. It appears that B has reached the server, so that rules out that the problem is from ISP B.
I checked the iptables but there is nothing that bans B ip! I checked hosts.deny file as well but there is nothing in it too.
What might be the problem? Is there any more tests that would help in reaching to the problem source?
Please advice
fedora linux-networking ping connection
asked Mar 21 '13 at 15:42
wael34218wael34218
2062413
I have 2 internet connections from 2 different ISPs with static IPs, lets call them A and B. A connects to the server in several ways (ping, SSH, HTTP), while B cannot do anything (ping, SSH, HTTP).
I ran tcpdump on the server using connection A, and then tried to call a webpage using B. It appears that B has reached the server, so that rules out that the problem is from ISP B.
I checked the iptables but there is nothing that bans B ip! I checked hosts.deny file as well but there is nothing in it too.
What might be the problem? Is there any more tests that would help in reaching to the problem source?
Please advice
fedora linux-networking ping connection
fedora linux-networking ping connection
asked Mar 21 '13 at 15:42
wael34218wael34218
2062413
asked Mar 21 '13 at 15:42
wael34218wael34218
2062413
asked Mar 21 '13 at 15:42
wael34218wael34218
2062413
asked Mar 21 '13 at 15:42
wael34218wael34218
2062413
asked Mar 21 '13 at 15:42
wael34218wael34218
2062413
2062413
1
It's obviously a routing problem on the server, probably you have A's gateway set as the default (even for B).
– NickW
Mar 21 '13 at 15:48
1
Have you properly configured with the server with two routing tables (one for each ISP) and a policy rule to select between them based on the source IP? If not, it can't possibly work.
– David Schwartz
Mar 21 '13 at 15:49
add a comment |
1
It's obviously a routing problem on the server, probably you have A's gateway set as the default (even for B).
– NickW
Mar 21 '13 at 15:48
1
Have you properly configured with the server with two routing tables (one for each ISP) and a policy rule to select between them based on the source IP? If not, it can't possibly work.
– David Schwartz
Mar 21 '13 at 15:49
1
1
It's obviously a routing problem on the server, probably you have A's gateway set as the default (even for B).
– NickW
Mar 21 '13 at 15:48
It's obviously a routing problem on the server, probably you have A's gateway set as the default (even for B).
– NickW
Mar 21 '13 at 15:48
1
1
Have you properly configured with the server with two routing tables (one for each ISP) and a policy rule to select between them based on the source IP? If not, it can't possibly work.
– David Schwartz
Mar 21 '13 at 15:49
Have you properly configured with the server with two routing tables (one for each ISP) and a policy rule to select between them based on the source IP? If not, it can't possibly work.
– David Schwartz
Mar 21 '13 at 15:49
add a comment |
2 Answers
2
active
oldest
votes
What I gather from your question:
One server connects to two routers, each connecting to a different ISP. Since ISP A is working, I assume that router A is your default Gateway. If someone connects to your server using ISP/Router B, the return traffic will be sent through router A, since that is the route your server knows. A-symmetric routing like this can be the cause of this problem.
answered Mar 21 '13 at 15:51
JelmerSJelmerS
697612
add a comment |
Show output of this commands:
ip link show
ip address show
ip route show
Probably, you have problems with routing. Did you configure multi-path routing? It does not work out-of-the-box
answered Mar 21 '13 at 15:59
Selivanov PavelSelivanov Pavel
1,58711941
No I did not configure multi-path routing
– wael34218
Mar 21 '13 at 16:12
1
Then that's your problem. The server has no way to know which route to use.
– David Schwartz
Mar 21 '13 at 17:52
add a comment |
Your Answer
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
What I gather from your question:
One server connects to two routers, each connecting to a different ISP. Since ISP A is working, I assume that router A is your default Gateway. If someone connects to your server using ISP/Router B, the return traffic will be sent through router A, since that is the route your server knows. A-symmetric routing like this can be the cause of this problem.
answered Mar 21 '13 at 15:51
JelmerSJelmerS
697612
add a comment |
What I gather from your question:
One server connects to two routers, each connecting to a different ISP. Since ISP A is working, I assume that router A is your default Gateway. If someone connects to your server using ISP/Router B, the return traffic will be sent through router A, since that is the route your server knows. A-symmetric routing like this can be the cause of this problem.
answered Mar 21 '13 at 15:51
JelmerSJelmerS
697612
add a comment |
What I gather from your question:
One server connects to two routers, each connecting to a different ISP. Since ISP A is working, I assume that router A is your default Gateway. If someone connects to your server using ISP/Router B, the return traffic will be sent through router A, since that is the route your server knows. A-symmetric routing like this can be the cause of this problem.
answered Mar 21 '13 at 15:51
JelmerSJelmerS
697612
What I gather from your question:
One server connects to two routers, each connecting to a different ISP. Since ISP A is working, I assume that router A is your default Gateway. If someone connects to your server using ISP/Router B, the return traffic will be sent through router A, since that is the route your server knows. A-symmetric routing like this can be the cause of this problem.
answered Mar 21 '13 at 15:51
JelmerSJelmerS
697612
answered Mar 21 '13 at 15:51
JelmerSJelmerS
697612
answered Mar 21 '13 at 15:51
JelmerSJelmerS
697612
answered Mar 21 '13 at 15:51
JelmerSJelmerS
697612
697612
add a comment |
add a comment |
Show output of this commands:
ip link show
ip address show
ip route show
Probably, you have problems with routing. Did you configure multi-path routing? It does not work out-of-the-box
answered Mar 21 '13 at 15:59
Selivanov PavelSelivanov Pavel
1,58711941
No I did not configure multi-path routing
– wael34218
Mar 21 '13 at 16:12
1
Then that's your problem. The server has no way to know which route to use.
– David Schwartz
Mar 21 '13 at 17:52
add a comment |
Show output of this commands:
ip link show
ip address show
ip route show
Probably, you have problems with routing. Did you configure multi-path routing? It does not work out-of-the-box
answered Mar 21 '13 at 15:59
Selivanov PavelSelivanov Pavel
1,58711941
No I did not configure multi-path routing
– wael34218
Mar 21 '13 at 16:12
1
Then that's your problem. The server has no way to know which route to use.
– David Schwartz
Mar 21 '13 at 17:52
add a comment |
Show output of this commands:
ip link show
ip address show
ip route show
Probably, you have problems with routing. Did you configure multi-path routing? It does not work out-of-the-box
answered Mar 21 '13 at 15:59
Selivanov PavelSelivanov Pavel
1,58711941
Show output of this commands:
ip link show
ip address show
ip route show
Probably, you have problems with routing. Did you configure multi-path routing? It does not work out-of-the-box
answered Mar 21 '13 at 15:59
Selivanov PavelSelivanov Pavel
1,58711941
answered Mar 21 '13 at 15:59
Selivanov PavelSelivanov Pavel
1,58711941
answered Mar 21 '13 at 15:59
Selivanov PavelSelivanov Pavel
1,58711941
answered Mar 21 '13 at 15:59
Selivanov PavelSelivanov Pavel
1,58711941
1,58711941
No I did not configure multi-path routing
– wael34218
Mar 21 '13 at 16:12
1
Then that's your problem. The server has no way to know which route to use.
– David Schwartz
Mar 21 '13 at 17:52
add a comment |
No I did not configure multi-path routing
– wael34218
Mar 21 '13 at 16:12
1
Then that's your problem. The server has no way to know which route to use.
– David Schwartz
Mar 21 '13 at 17:52
No I did not configure multi-path routing
– wael34218
Mar 21 '13 at 16:12
No I did not configure multi-path routing
– wael34218
Mar 21 '13 at 16:12
1
1
Then that's your problem. The server has no way to know which route to use.
– David Schwartz
Mar 21 '13 at 17:52
Then that's your problem. The server has no way to know which route to use.
– David Schwartz
Mar 21 '13 at 17:52
add a comment |
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1
It's obviously a routing problem on the server, probably you have A's gateway set as the default (even for B).
– NickW
Mar 21 '13 at 15:48
1
Have you properly configured with the server with two routing tables (one for each ISP) and a policy rule to select between them based on the source IP? If not, it can't possibly work.
– David Schwartz
Mar 21 '13 at 15:49