Debian – Unable to ping, although can download packages

I've installed Debian Squeeze on a Dell PowerEdge server. However, I'm facing some problem with configuring the network. Although I can ping machines inside my network, I'm unable to d0 so outside the network (google.com). The strangest thing is, I can update the packages from Debian repositories, and install them!

DNS resolution is working fine — verified with host google.com.

I understand this should be some problem related to network configurations and/or firewall. However, am unable to figure out the issue. I would really appreciate any help.

Contents /etc/network/interfaces

# The loopback network interface
auto lo
iface lo inet loopback

auto eth0
allow-hotplug eth0
#iface eth0 inet dhcp
iface eth0 inet static
    address 10.14.85.244  
    netmask 255.255.0.0
    network 10.14.0.0
    gateway 10.14.1.2

Contents of /etc/resolv.conf

domain sit.iitkgp
search sit.iitkgp
nameserver 10.14.0.2

Contents of /etc/apt/apt.conf

Acquire::http::proxy "http://IP:PORT/";    # Values are actually used here
Acquire::ftp::proxy "ftp://IP:PORT/";
Acquire::https::proxy "https://IP:PORT/";

iptables

# 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 

Routes

# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
10.14.0.0       0.0.0.0         255.255.0.0     U     0      0        0 eth0
0.0.0.0         10.14.1.2       0.0.0.0         UG    0      0        0 eth0

Near the end of this ping strace something like EAGAIN (Resource temporarily unavailable) could be seen. This message doesn't appear when I ping (successfully) an internal IP address. Please be assured that this is a new server, and more than enough disk and memory spaces are available.

Update

Just noticed that tcptraceroute is working fine:

# tcptraceroute -i eth0 google.com
Selected device eth0, address 10.14.85.244, port 53532 for outgoing packets
Tracing the path to google.com (74.125.236.80) on TCP port 80 (www), 30 hops max
 1  10.14.1.2  0.310 ms  0.283 ms  0.281 ms
 2  10.151.1.2  0.274 ms  0.253 ms  0.281 ms
 3  maa03s05-in-f16.1e100.net (74.125.236.80) [closed]  0.141 ms  0.172 ms  0.227 ms

Update & Resolution

I believe ICMP messages are being blocked by the firewall. Also, the concerned server has no public IP address. I think that also has something to do with it. The other machine from which I could ping google.com has a public IP address.

My major concern, however, was that apt-get did work, but not lynx or wget. The problem was with the proxy environment variables. They were set in .bashrc file, but not export-ed. I had failed to notice this. Once I did export them, things are running smooth.

Thanks to all for providing insights!